Pokémon Red and Blue/RAM map

The following article is a RAM map for Pokémon Red and Blue.

Currently, many more memory addresses can be found in the Pokémon Red disassembly project (WRAM, VRAM, HRAM, SRAM).

Saved data (SRAM)

Bank 0

Sprite decompression zone + Hall of Fame

A000 - A187 : Sprite buffer #0
A188 - A30F : Sprite buffer #1
A310 - A497 : Sprite buffer #2

A498 - A597 : Unused ?

A598 - B857 : Hall Of Fame data

B858 - BFFF : Unused ?

Note : this is the reason Missingno corrupts the HoF data : its invalid sprite, when decompressed, overwrites data past the buffers' boundaries... right into HoF data.

Other Pokémon with even larger corruptions reach WRAM - usually leading to crashes.

Bank 1

A000 - A597 : Unused ?

A598 - A5A2 : Player name
A5A3 - AD2B : Main data
AD2C - AF2B : Sprite data
AF2C - B0BF : Party data
B0C0 - B521 : Current box data
B522        : Tileset type
B523        : Main data checksum

B524 - BFFF : Unused ?

Bank 2

Pokémon boxes 1-6

A000 - A461 : Box 1
A462 - A8C3 : Box 2
A8C4 - AD25 : Box 3
AD26 - B187 : Box 4
B188 - B5E9 : Box 5
B5EA - BA4B : Box 6
BA4C        : Global checksum
BA4D - BA52 : Individual checksums

BA53 - BFFF : Unused

Bank 3

Pokémon boxes 7-12

A000 - A461 : Box 7
A462 - A8C3 : Box 8
A8C4 - AD25 : Box 9
AD26 - B187 : Box 10
B188 - B5E9 : Box 11
B5EA - BA4B : Box 12
BA4C        : Global checksum
BA4D - BA52 : Individual checksums

BA53 - BFFF : Unused

Main data (WRAM)

Audio

Addresses C000 to C0F2 are used by the sound engine.

C002 - Bit 7 : 1 if audio is muted. Other bits : if non-zero, pauses music and continues SFX until it ends.
C0DE - Volumes for all music channels (and fade for those who support it)
C0EF - Current sound bank
C0F0 - Saved sound bank

Bytes C0F3 to C0FF are undocumented (if used)

Sprite Data

C100 to C1FF : Data for all sprites on the current map
               Holds info for 16 sprites with $10 bytes each
               Note : player is always sprite 0

Replace x with the sprite ID
    C1x0: picture ID (fixed, loaded at map init)
    C1x1: movement status (0: uninitialized, 1: ready, 2: delayed, 3: moving)
    C1x2: sprite image index (changed on update, $ff if off screen, includes facing direction, progress in walking animation and a sprite-specific offset)
    C1x3: Y screen position delta (-1,0 or 1; added to c1x4 on each walking animation update)
    C1x4: Y screen position (in pixels, always 4 pixels above grid which makes sprites appear to be in the center of a tile)
    C1x5: X screen position delta (-1,0 or 1; added to c1x6 on each walking animation update)
    C1x6: X screen position (in pixels, snaps to grid if not currently walking)
    C1x7: intra-animation-frame counter (counting upwards to 4 until c1x8 is incremented)
    C1x8: animation frame counter (increased every 4 updates, hold four states (totalling to 16 walking frames)
    C1x9: facing direction (0: down, 4: up, 8: left, $c: right)
    C1xA to C1xF are unudocumented (if used)

C200 to C2FF : More data for all sprites on the current map
               Holds info for 16 sprites with $10 bytes each
               Note : player sprite is always sprite 0

    C2x0: walk animation counter (counting from $10 backwards when moving)
    C2x1:
    C2x2: Y displacement (initialized at 8, supposed to keep moving sprites from moving too far, but bugged)
    C2x3: X displacement (initialized at 8, supposed to keep moving sprites from moving too far, but bugged)
    C2x4: Y position (in 2x2 tile grid steps, topmost 2x2 tile has value 4)
    C2x5: X position (in 2x2 tile grid steps, leftmost 2x2 tile has value 4)
    C2x6: movement byte 1 (determines whether a sprite can move, $ff:not moving, $fe:random movements, others unknown)
    C2x7: (?) (set to $80 when in grass, else $0; may be used to draw grass above the sprite)
    C2x8: delay until next movement (counted downwards, status (c1x1) is set to ready if reached 0)
    C2x9 to C2xD are undocumented
    C2xE: sprite image base offset (in video ram, player always has value 1, used to compute c1x2)
    C2xF isn't documented

C300 to C39F : OAM DMA buffer (source for the DMA Transfer)

Tile Data

C3A0 to C507 : Buffer of all tiles onscreen
C508 to C5CF : Copy of previous buffer (used to restore tiles after closing menus)

Menu Data

Coordinates of the position of the cursor for the top menu item (id 0)
CC24 : Y position
CC25 : X position

CC26 - Currently selected menu item (topmost is 0)
CC27 - Tile "hidden" by the menu cursor
CC28 - ID of the last menu item
CC29 - bitmask applied to the key port for the current menu
CC2A - ID of the previously selected menu item
CC2B - Last position of the cursor on the party / Bill's PC screen
CC2C - Last position of the cursor on the item screen
CC2D - Last position of the cursor on the START / battle menu
CC2F - Index (in party) of the Pokémon currently sent out
CC30~CC31 - Pointer to cursor tile in C3A0 buffer
CC36 - ID of the first displayed menu item
CC35 - Item highlighted with Select (01 = first item, 00 = no item, etc.)

CC3A and CC3B are unused

Link Data

CC3C to CC49 hold data used for Cable Club stuff

The meaning of CC47 depends on the context
CC47 - Link timeout counter
CC47 - Is player entering Cable Club ?

Misc.

CC97 to CCA0 : buffer for when swapping party Pokémon

Battle

CCD5 - Number of turns in current battle
CCD6 is undocumented (if used)
CCD7 - Player's Substitute HP
CCD8 - Enemy Substitute HP
CCDB - Move menu type : 0 is regular, 1 is mimic, other are text boxes (learn, PP-refill...)
CCDC - Player-selected move
CCDD - Enemy-selected move
CCE5~CCE7 - Money earned by Pay Day

Safari Zone data :

CCE8 - Opponent escaping factor
CCE9 - Opponent baiting factor

CCED - Is current Pokémon disobedient ?
CCEE - Player's disabled move
CCEF - Enemy's disabled move
CCF6 - Is low-health alarm disabled ?
CD05~CD06 - Amount of damage the enemy accumulated while Biding
CD1A - Player's Pokémon Attack modifier (7 means no modifier)
CD1B - Player's Pokémon Defense modifier
CD1C - Player's Pokémon Speed modifier
CD1D - Player's Pokémon Special modifier
CD1E - Player's Pokémon Accuracy modifier
CD1F - Player's Pokémon Evasion modifier
CD2D - Engaged Trainer class / legendary Pokémon ID
CD2E - Engaged Trainer roster ID / Enemy's Pokémon Attack modifier (7 means no modifier)
CD2F - Enemy's Pokémon Defense modifier
CD30 - Enemy's Pokémon Speed modifier
CD31 - Enemy's Pokémon Special modifier
CD32 - Enemy's Pokémon Accuracy modifier
CD33 - Enemy's Pokémon Evasion modifier

Joypad simulation

CD38 - Is joypad input being simulated ?

Pokémon Mart

CF7B - Total Items
CF7C - Item 1
CF7D - Item 2
CF7E - Item 3
CF7F - Item 4
CF80 - Item 5
CF81 - Item 6
CF82 - Item 7
CF83 - Item 8
CF84 - Item 9
CF85 - Item 10

Name Rater

CF92 - Which Pokémon does Name Rater Change?

Battle

CFD3 - Your Move Effect (e.g. 10h = coins scatter everywhere)
CFD5 - Your Move Type
CCDC - Your Move Used

CFCC - Enemy's Move ID
CFCD - Enemy's Move Effect
CFCE - Enemy's Move Power
CFCF - Enemy's Move Type
CFD0 - Enemy's Move Accuracy
CFD1 - Enemy's Move Max PP
CFD2 - Player's Move ID
CFD3 - Player's Move Effect
CFD4 - Player's Move Power
CFD5 - Player's Move Type
CFD6 - Player's Move Accuracy
CFD7 - Player's Move Max PP
CFD8 - Enemy's Pokémon internal ID
CFD9 - Player's Pokémon internal ID
CFDA-CFE4 - Enemy's Name
CFE5 - Enemy's Pokémon internal ID
CFE6-CFE7 - Enemy's HP
CFE8 - Enemy's Level
CFE9 - Enemy's Status
        Bit 6 : Paralyzed
        Bit 5 : Frozen
        Bit 4 : Burned
        Bit 3 : Poisoned
        Bits 0-2 : Sleep counter
CFEA - Enemy's Type 1
CFEB - Enemy's Type 2
CFEC - Enemy's Catch Rate (Unused, only referenced by Transform script, the one actually used is at D007)
CFED - Enemy's Move 1
CFEE - Enemy's Move 2
CFEF - Enemy's Move 3
CFF0 - Enemy's Move 4
CFF1 - Enemy's Attack and Defense DVs
CFF2 - Enemy's Speed and Special DVs
CFF3 - Enemy's Level
CFF4-CFF5 - Enemy's Max HP
CFF6-CFF7 - Enemy's Attack
CFF8-CFF9 - Enemy's Defense
CFFA-CFFB - Enemy's Speed
CFFC-CFFD - Enemy's Special
CFFE - Enemy's PP (First Slot)
CFFF - Enemy's PP (Second Slot)
D000 - Enemy's PP (Third Slot)
D001 - Enemy's PP (Fourth Slot)
D002-D006 - Enemy's Base Stats
D007 - Enemy's Catch Rate
D008 - Enemy's Base Experience

Pokémon 1st Slot (In-Battle)

D009-D013 - Name
D014 - Pokémon Number
D015-D016 - Current HP
D017 -
D018 - Status
        Bit 6 : Paralyzed
        Bit 5 : Frozen
        Bit 4 : Burned
        Bit 3 : Poisoned
        Bits 0-2 : Sleep counter
D019 - Type 1
D01A - Type 2
D01B - 
D01C - Move #1 (First Slot)
D01D - Move #2 (Second Slot)
D01E - Move #3 (Third Slot)
D01F - Move #4 (Fourth Slot)
D020 - Attack and Defense DVs
D021 - Speed and Special DVs
D022 - Level
D023-D024 - Max HP
D025-D026 - Attack
D027-D028 - Defense
D029-D02A - Speed
D02B-D02C - Special
D02D - PP (First Slot)
D02E - PP (Second Slot)
D02F - PP (Third Slot)
D030 - PP (Fourth Slot)

D057 - Type of battle

D05A - Battle Type (Normal battle, Safari Zone, Old Man battle...)

D05C - Is Gym Leader battle music playing?
D05D - 
D05E - Critical Hit / OHKO Flag
       01 - Critical Hit!
       02 - One-hit KO!
D05F - Hooked Pokémon Flag

D062-D064 - Battle Status (Player)
          D062:
            bit 0 - Bide
            bit 1 - Thrash / petal dance
            bit 2 - Attacking multiple times (e.g. double kick)
            bit 3 - Flinch
            bit 4 - Charging up for attack
            bit 5 - Using multi-turn move (e.g. wrap)
            bit 6 - Invulnerable to normal attack (using fly/dig)
            bit 7 - Confusion
          D063:
            bit 0 - X Accuracy effect
            bit 1 - protected by "mist"
            bit 2 - focus energy effect
            bit 4 - has a substitute
            bit 5 - need to recharge
            bit 6 - rage
            bit 7 - leech seeded
          D064:
            bit 0 - toxic
            bit 1 - light screen
            bit 2 - reflect
            bit 3 - tranformed
D065 - Stat to double (CPU)
D066 - Stat to halve (CPU)
D067-D069 - Battle Status (CPU) - Includes the "Transformed" status in D069 which makes the game regard the opponent as a Ditto.
D06A - Multi-Hit Move counter (Player)
D06B - Confusion counter (Player)
D06C - Toxic counter (Player)
D06D-D06E - Disable counter (Player)
D06F - Multi-Hit Move counter (CPU)
D070 - Confusion counter (CPU)
D071 - Toxic counter (CPU)
D072 - Disable counter (CPU)

D0D8 - Amount of damage attack is about to do. Max possible damage may appear one frame before actual damage.

Game Corner

D13D - 1st Game Corner Prize
D13E - 2nd Game Corner Prize
D13F - 3rd Game Corner Prize

Link Battle PRNG

D148-D150 - 9 Pseudo-Random Numbers used during Link Battles. Once a batch is used up, it generates a new batch with n × 5 + 1.

Player

D158-D162 - Your Name

D163 - # Pokémon In Party
D164 - Pokémon 1
D165 - Pokémon 2
D166 - Pokémon 3
D167 - Pokémon 4
D168 - Pokémon 5
D169 - Pokémon 6
D16A - End of list

Pokémon 1

D16B - Pokémon (Again)
D16C-D16D - Current HP
D16E - 'Level' (not the actual level, see the notes article)
D16F - Status (Poisoned, Paralyzed, etc.)
D170 - Type 1
D171 - Type 2
D172 - Catch rate/Held item (When traded to Generation II)
D173 - Move 1
D174 - Move 2
D175 - Move 3
D176 - Move 4
D177-D178 - Trainer ID
D179-D17B - Experience
D17C-D17D - HP EV
D17E-D17F - Attack EV
D180-D181 - Defense EV
D182-D183 - Speed EV
D184-D185 - Special EV
D186 - Attack/Defense IV
D187 - Speed/Special IV
D188 - PP Move 1
D189 - PP Move 2
D18A - PP Move 3
D18B - PP Move 4
D18C - Level (actual level)
D18D-D18E - Max HP
D18F-D190 - Attack
D191-D192 - Defense
D193-D194 - Speed
D195-D196 - Special

Pokémon 2

D197 - Pokémon
D198-D199 - Current HP
D19A - 'Level' (not the actual level, see the notes article)
D19B - Status
D19C - Type 1
D19D - Type 2
D19E - Catch rate/Held item (When traded to Generation II)
D19F - Move 1
D1A0 - Move 2
D1A1 - Move 3
D1A2 - Move 4
D1A3-D1A4 - Trainer ID
D1A5-D1A7 - Experience 
D1A8-D1A9 - HP EV
D1AA-D1AB - Attack EV
D1AC-D1AD - Defense EV
D1AE-D1AF - Speed EV
D1B0-D1B1 - Special EV
D1B2 - Attack/Defense IV
D1B3 - Speed/Special IV
D1B4 - PP Move 1
D1B5 - PP Move 2
D1B6 - PP Move 3
D1B7 - PP Move 4
D1B8 - Level (actual)
D1B9-D1BA - Max HP
D1BB-D1BC - Attack
D1BD-D1BE - Defense
D1BF-D1C0 - Speed
D1C1-D1C2 - Special

Pokémon 3

D1C3 - Pokémon
D1C4-D1C5 - Current HP
D1C6 - 'Level' (not the actual level, see the notes article)
D1C7 - Status
D1C8 - Type 1
D1C9 - Type 2
D1CA - Catch rate/Held item (When traded to Generation II)
D1CB - Move 1
D1CC - Move 2
D1CD - Move 3
D1CE - Move 4
D1CF-D1D0 - Trainer ID
D1D1-D1D3 - Experience
D1D4-D1D5 - HP EV
D1D6-D1D7 - Attack EV
D1D8-D1D9 - Defense EV
D1DA-D1DB - Speed EV
D1DC-D1DD - Special EV
D1DE - Attack/Defense IV
D1DF - Speed/Special IV
D1E0 - PP Move 1
D1E1 - PP Move 2
D1E2 - PP Move 3
D1E3 - PP Move 4
D1E4 - Level
D1E5-D1E6 - Max HP
D1E7-D1E8 - Attack
D1E9-D1EA - Defense
D1EB-D1EC - Speed
D1ED-D1EE - Special

Pokémon 4

D1EF - Pokémon
D1F0-D1F1 - Current HP
D1F2 - 'Level' (not the actual level, see the notes article)
D1F3 - Status
D1F4 - Type 1
D1F5 - Type 2
D1F6 - Catch rate/Held item (When traded to Generation II)
D1F7 - Move 1
D1F8 - Move 2
D1F9 - Move 3
D1FA - Move 4
D1FB-D1FC - Trainer ID
D1FD-D1FF - Experience 
D200-D201 - HP EV
D202-D203 - Attack EV
D204-D205 - Defense EV
D206-D207 - Speed EV
D208-D209 - Special EV
D20A - Attack/Defense IV
D20B - Speed/Special IV
D20C - PP Move 1
D20D - PP Move 2
D20E - PP Move 3
D20F - PP Move 4
D210 - Level
D211-D212 - Max HP
D213-D214 - Attack
D215-D216 - Defense
D217-D218 - Speed
D219-D21A - Special

Pokémon 5

D21B - Pokémon
D21C-D21D - Current HP
D21E - 'Level' (not the actual level, see the notes article)
D21F - Status
D220 - Type 1
D221 - Type 2
D222 - Catch rate/Held item (When traded to Generation II)
D223 - Move 1
D224 - Move 2
D225 - Move 3
D226 - Move 4
D227-D228 - Trainer ID
D229-D22B - Experience 
D22C-D22D - HP EV
D22E-D22F - Attack EV
D230-D231 - Defense EV
D232-D233 - Speed EV
D234-D235 - Special EV
D236 - Attack/Defense IV
D237 - Speed/Special IV
D238 - PP Move 1
D239 - PP Move 2
D23A - PP Move 3
D23B - PP Move 4
D23C - Level
D23D-D23E - Max HP
D23F-D240 - Attack
D241-D242 - Defense
D243-D244 - Speed
D245-D246 - Special

Pokémon 6

D247 - Pokémon
D248-D249 - Current HP
D24A - 'Level' (not the actual level, see the notes article)
D24B - Status
D24C - Type 1
D24D - Type 2
D24E - Catch rate/Held item (When traded to Generation II)
D24F - Move 1
D250 - Move 2
D251 - Move 3
D252 - Move 4
D253-D254 - Trainer ID
D255-D257 - Experience 
D258-D259 - HP EV
D25A-D25B - Attack EV
D25C-D25D - Defense EV
D25E-D25F - Speed EV
D260-D261 - Special EV
D262 - Attack/Defense IV
D263 - Speed/Special IV
D264 - PP Move 1
D265 - PP Move 2
D266 - PP Move 3
D267 - PP Move 4
D268 - Level
D269-D26A - Max HP
D26B-D26C - Attack
D26D-D26E - Defense
D26F-D270 - Speed
D271-D272 - Special

Trainer Name

D273-D27D - Trainer name for 1st
D27E-D288 - Trainer name for 2nd
D289-D293 - Trainer name for 3rd
D294-D29E - Trainer name for 4th
D29F-D2A9 - Trainer name for 5th
D2AA-D2B4 - Trainer name for 6th

Nickname

D2B5-D2BF - Nickname for 1st
D2C0-D2CA - Nickname for 2nd
D2CB-D2D5 - Nickname for 3rd
D2D6-D2E0 - Nickname for 4th
D2E1-D2EB - Nickname for 5th
D2EC-D2F6 - Nickname for 6th

Pokedex

D2F7 - Own 1-8

D2F8 - Own 9-16

D2F9 - Own 17-24

D2FA - Own 25-32

D2FB - Own 33-40

D2FC - Own 41-48

D2FD - Own 49-56

D2FE - Own 57-64

D2FF - Own 65-72

D300 - Own 73-80

D301 - Own 81-88

D302 - Own 89-96

D303 - Own 97-104

D304 - Own 105-112

D305 - Own 113-120

D306 - Own 121-128

D307 - Own 129-136

D308 - Own 137-144

D309 - Own 145-152

D30A - Seen 1-8

D30B - Seen 9-16

D30C - Seen 17-24

D30D - Seen 25-32

D30E - Seen 33-40

D30F - Seen 41-48

D310 - Seen 49-56

D311 - Seen 57-64

D312 - Seen 65-72

D313 - Seen 73-80

D314 - Seen 81-88

D315 - Seen 89-96

D316 - Seen 97-104

D317 - Seen 105-112

D318 - Seen 113-120

D319 - Seen 121-128

D31A - Seen 129-136

D31B - Seen 137-144

D31C - Seen 145-152

Items

D31D - Total Items

D31E - Item 1

D31F - Item 1 Quantity

D320 - Item 2

D321 - Item 2 Quantity

D322 - Item 3

D323 - Item 3 Quantity

D324 - Item 4

D325 - Item 4 Quantity

D326 - Item 5

D327 - Item 5 Quantity

D328 - Item 6

D329 - Item 6 Quantity

D32A - Item 7

D32B - Item 7 Quantity

D32C - Item 8

D32D - Item 8 Quantity

D32E - Item 9

D32F - Item 9 Quantity

D330 - Item 10

D331 - Item 10 Quantity

D332 - Item 11

D333 - Item 11 Quantity

D334 - Item 12

D335 - Item 12 Quantity

D336 - Item 13

D337 - Item 13 Quantity

D338 - Item 14

D339 - Item 14 Quantity

D33A - Item 15

D33B - Item 15 Quantity

D33C - Item 16

D33D - Item 16 Quantity

D33E - Item 17

D33F - Item 17 Quantity

D340 - Item 18

D341 - Item 18 Quantity

D342 - Item 19

D343 - Item 19 Quantity

D344 - Item 20

D345 - Item 20 Quantity

D346 - Item End of List

Money

D347 - Money Byte 1

D348 - Money Byte 2

D349 - Money Byte 3

Rival

D34A-D351 - Rival's Name

Miscellaneous

D355 - Options

Bit 7 = Battle Animation (1 = Off, 0 = On)

Bit 6 = Battle Style (1 = Set, 0 = Shift)

Bit 5-4 = probably unused

Low Nybble = Text Speed (0x0 = fastest, 0xF = slowest)

Fast = 1

Medium = 3

Slow = 5

D356 = Badges (Binary Switches)

D358 = If bit0 = 0, delay is limited to 1 frame between each letter. If bit1 = 0, no delay during text printing. Overrides previous setting.

D359 = Player ID [1] (Multiple of 256) D35A = Player ID [2] (...+1-255)

D35B = Audio track (See Audio section) D35C = Audio bank (See Audio section)

D35D = Controls the map's palette. Usually 0, but is set to 6 when Flash is required.

D35E = Current Map Number

D35F-D360 = Event Displacement (view Notes, for more info)

D361 - 1 byte integer = Current Player Y-Position

D362 - 1 byte integer = Current Player X-Position

D363 = Current Player Y-Position (Current Block)

D364 = Current Player X-Position (Current Block)

D365 = Last map location for walking through certain exits (e.g. Safari Zone gate)

Audio

C022 = Audio track channel 1

C023 = Audio track channel 2

C024 = Audio track channel 3

C025 = Audio track channel 4

C0E8, C0E9 = Music tempo (lower values in C0E9 may = faster except for particularly low values)

C0EA, C0EB = Sound effects tempo

C0EC, C0ED = Sound effects header pointer

C0EE = New sound ID

C0EF = Audio bank

C0F0 = Audio bank

D35B = Audio track in current map

D35C = Audio bank in current map

Bank 02

B3 = Validate

B4 = Bump

B5 = Exit of a house

B6 = Save Game

B8 = Pokéflute

B9 = Ding Dong

BA = PalletTown

BD = Pokecenter

C0 = Gym

C3 = Viridian City, Pewter City, Saffron City

C7 = Cerulean City, Fuchsia City

CA = Celadon City

CD = Cinnabar City

D0 = Vermilion City

D4 = Lavender Town

D8 = SS Anne

DB = Meet Oak

DE = Meet Blue

E1 = Follow me

E5 = Safari Zone / Evolution

E8 = Pokémon Healding

EB = Road 1, 2

EF = Road 24, 25

F3 = Road 3, 4, 5, 6, 7, 8, 9, 10, 16, 17, 18, 19, 20, 21, 22

F7 = Road 11, 12, 13, 14, 15

FB = Indigo Plateau

Bank 08

EA = Gym Leader Battle

ED = Trainer Battle

F0 = Wild Battle

F3 = Final Battle

F6 = Defeated Trainer

F9 = Defeated Wild Pokemon

FC = Defeated Champion / Gym

Bank 1F

C3 = Title Screen

C7 = Credits

CA = Hall of fame

CD = Oak's Lab

D0 = Jigglypuff Song

D2 = Bike Riding

D6 = Surfing

D9 = Came Corner

DC = Intro Game

DF = Power Plant, Unknown Dungeon, Rocket HQ

E3 = Viridian Forest, Seafoam Islands

E7 = Mt. Moon, Rock Tunnel, Victory Road

EB = Cinnabar City Mansion

EF = Pokemon Tower

F2 = Silph Co.

F5 = Eye contact Evil Trainer

F8 = Eye contact Female Trainer

FB = Eye contact Male Trainer

FF = Stop Sound

Map Header

D367 - 1 byte integer = Map's Tileset, 1 byte

D368 - 1 byte integer = Map's Height (Blocks)

D369 - 1 byte integer = Map's Width (Blocks)

D36A-D36B = Map's Data

D36C-D36D = Map's Text Pointer Table (For Each NPC) Location

D36E-D36F = Map's Level-Script Pointer

D370 = Map's Connection Byte

D371-D37B = Map's 1st Connection Data

D37C-D386 = Map's 2nd Connection Data

D387-D391 = Map's 3rd Connection Data

D392-D39C = Map's 4th Connection Data

Tileset Header

D52B = Tileset Bank

D52C-D52D = Pointer to Blocks

D52E-D52F = Pointer to GFX

D530-D531 = Pointer to Collision Data

D532-D534 = "Talking-Over" Tiles

D535 = Grass Tile

Tile graphics

Tiles are 8x8 pixels, stored in 16 bytes, with each byte representing 4 pixels.

For size comparison, the player is 16x16 pixels, therefore, 4 tiles.

"Active" tiles are stored sequentially in RAM, starting at address 0x8000. From address 0x8000 to 0x9000 there are 256 tiles which make up the player in all orientations, and some commonly used stuff. The real map tiles are from 0x9000 to 0x9600.

8000 - 16 byte tile graphic struct = tile 0 (often the top left player tile)

8010 - 16 byte tile graphic struct = tile 1 (often the top right player tile)

8020 - 16 byte tile graphic struct = tile 2 (often the bottom left player tile)

...

9000 - 16 byte tile graphic struct = map tile 0 (often blank)

9010 - 16 byte tile graphic struct = map tile 1

9020 - 16 byte tile graphic struct = map tile 2

...

Stored Items

D53A - Total items in storage

D53B - Stored Item 1

D53C - Stored Item 1 Quantity

D53D - Stored Item 2

D53E - Stored Item 2 Quantity

D53F - Stored Item 3

D540 - Stored Item 3 Quantity

D541 - Stored Item 4

D542 - Stored Item 4 Quantity

D543 - Stored Item 5

D544 - Stored Item 5 Quantity

D545 - Stored Item 6

D546 - Stored Item 6 Quantity

D547 - Stored Item 7

D548 - Stored Item 7 Quantity

D549 - Stored Item 8

D54A - Stored Item 8 Quantity

D54B - Stored Item 9

D54C - Stored Item 9 Quantity

D54D - Stored Item 10

D54E - Stored Item 10 Quantity

D54F - Stored Item 11

D550 - Stored Item 11 Quantity

D551 - Stored Item 12

D552 - Stored Item 12 Quantity

D553 - Stored Item 13

D554 - Stored Item 13 Quantity

D555 - Stored Item 14

D556 - Stored Item 14 Quantity

D557 - Stored Item 15

D558 - Stored Item 15 Quantity

D559 - Stored Item 16

D55A - Stored Item 16 Quantity

D55B - Stored Item 17

D55C - Stored Item 17 Quantity

D55D - Stored Item 18

D55E - Stored Item 18 Quantity

D55F - Stored Item 19

D560 - Stored Item 19 Quantity

D561 - Stored Item 20

D562 - Stored Item 20 Quantity

D563 - Stored Item 21

D564 - Stored Item 21 Quantity

D565 - Stored Item 22

D566 - Stored Item 22 Quantity

D567 - Stored Item 23

D568 - Stored Item 23 Quantity

D569 - Stored Item 24

D56A - Stored Item 24 Quantity

D56B - Stored Item 25

D56C - Stored Item 25 Quantity

D56D - Stored Item 26

D56E - Stored Item 26 Quantity

D56F - Stored Item 27

D570 - Stored Item 27 Quantity

D571 - Stored Item 28

D572 - Stored Item 28 Quantity

D573 - Stored Item 29

D574 - Stored Item 29 Quantity

D575 - Stored Item 30

D576 - Stored Item 30 Quantity

D577 - Stored Item 31

D578 - Stored Item 31 Quantity

D579 - Stored Item 32

D57A - Stored Item 32 Quantity

D57B - Stored Item 33

D57C - Stored Item 33 Quantity

D57D - Stored Item 34

D57E - Stored Item 34 Quantity

D57F - Stored Item 35

D580 - Stored Item 35 Quantity

D581 - Stored Item 36

D582 - Stored Item 36 Quantity

D583 - Stored Item 37

D584 - Stored Item 37 Quantity

D585 - Stored Item 38

D586 - Stored Item 38 Quantity

D587 - Stored Item 39

D588 - Stored Item 39 Quantity

D589 - Stored Item 40

D58A - Stored Item 40 Quantity

D58B - Stored Item 41

D58C - Stored Item 41 Quantity

D58D - Stored Item 42

D58E - Stored Item 42 Quantity

D58F - Stored Item 43

D590 - Stored Item 43 Quantity

D591 - Stored Item 44

D592 - Stored Item 44 Quantity

D593 - Stored Item 45

D594 - Stored Item 45 Quantity

D595 - Stored Item 46

D596 - Stored Item 46 Quantity

D597 - Stored Item 47

D598 - Stored Item 47 Quantity

D599 - Stored Item 48

D59A - Stored Item 48 Quantity

D59B - Stored Item 49

D59C - Stored Item 49 Quantity

D59D - Stored Item 50

D59E - Stored Item 50 Quantity

D59F - Stored Items End of List

Game Coins

D5A4 - Casino Chips Byte 1

D5A5 - Casino Chips Byte 2

Event Flags

D5A6 to D5C5 : Missable Objects Flags (flags for every (dis)appearing sprites, like the guard in Cerulean City or the Pokéballs in Oak's Lab)

D5AB - Starters Back?

D5C0(bit 1) - 0=Mewtwo appears, 1=Doesn't (See D85F)

D5F3 - Have Town map?

D60D - Have Oak's Parcel?

D700 - Bike Speed

D70B - Fly Anywhere Byte 1

D70C - Fly Anywhere Byte 2

D70D - Safari Zone Time Byte 1

D70E - Safari Zone Time Byte 2

D710 - Fossilized Pokémon?

D714 - Position in Air

D72E - Did you get Lapras Yet?

D732 - Debug New Game

D751 - Fought Giovanni Yet?

D755 - Fought Brock Yet?

D75E - Fought Misty Yet?

D773 - Fought Lt. Surge Yet?

D77C - Fought Erika Yet?

D782 - Fought Articuno Yet?

D790 - If bit 7 is set, Safari Game over

D792 - Fought Koga Yet?

D79A - Fought Blaine Yet?

D7B3 - Fought Sabrina Yet?

D7D4 - Fought Zapdos Yet?

D7D8 - Fought Snorlax Yet (Vermilion)

D7E0 - Fought Snorlax Yet? (Celadon)

D7EE - Fought Moltres Yet?

D803 - Is SS Anne here?

D85F - Mewtwo can be caught if bit 2 clear - Needs D5C0 bit 1 clear, too

Wild Pokémon

D887 - Wild Pokémon encounter rates

Common Battles:

D888 - Level of Encounter 1

D889 - Pokémon Data Value 1

D88A - Level of Encounter 2

D88B - Pokémon Data Value 2

D88C - Level of Encounter 3

D88D - Pokémon Data Value 3

D88E - Level of Encounter 4

D88F - Pokémon Data Value 4

Uncommon Battles:

D890 - Level of Encounter 1

D891 - Pokémon Data Value 1

D892 - Level of Encounter 2

D893 - Pokémon Data Value 2

D894 - Level of Encounter 3

D895 - Pokémon Data Value 3

D896 - Level of Encounter 4

D897 - Pokémon Data Value 4

Rare Battles:

D898 - Level of Encounter 1

D899 - Pokémon Data Value 1

D89A - Level of Encounter 2

D89B - Pokémon Data Value 2

Opponent Trainer’s Pokémon

D89C - Total enemy Pokémon

D89D - Pokémon 1

D89E - Pokémon 2

D89F - Pokémon 3

D8A0 - Pokémon 4

D8A1 - Pokémon 5

D8A2 - Pokémon 6

D8A3 - End of list

Pokémon 1

D8A4 - Pokémon

D8A5-D8A6 - Current HP

D8A7 -

D8A8 - Status

D8A9 - Type 1

D8AA - Type 2

D8AB -

D8AC - Move 1

D8AD - Move 2

D8AE - Move 3

D8AF - Move 4

D8B0-D8B1 - Trainer ID

D8B2-D8B4 - Experience

D8B5-D8B6 - HP EV

D8B7-D8B8 - Attack EV

D8B9-D8BA - Defense EV

D8BB-D8BC - Speed EV

D8BD-D8BE - Special EV

D8BF - Attack/Defense IV

D8C0 - Speed/Special IV

D8C1 - PP Move 1

D8C2 - PP Move 2

D8C3 - PP Move 3

D8C4 - PP Move 4

D8C5 - Level

D8C6-D8C7 - Max HP

D8C8-D8C9 - Attack

D8CA-D8CB - Defense

D8CC-D8CD - Speed

D8CE-D8CF - Special

Pokémon 2

D8D0 - Pokémon

D8D1-D8D2 - Current HP

D8D3 -

D8D4 - Status

D8D5 - Type 1

D8D6 - Type 2

D8D7 -

D8D8 - Move 1

D8D9 - Move 2

D8DA - Move 3

D8DB - Move 4

D8DC-D8DD - Trainer ID

D8DE-D8E0 - Experience

D8E1-D8E2 - HP EV

D8E3-D8E4 - Attack EV

D8E5-D8E6 - Defense EV

D8E7-D8E8 - Speed EV

D8E9-D8EA - Special EV

D8EB - Attack/Defense IV

D8EC - Speed/Special IV

D8ED - PP Move 1

D8EE - PP Move 2

D8EF - PP Move 3

D8F0 - PP Move 4

D8F1 - Level

D8F2-D8F3 - Max HP

D8F4-D8F5 - Attack

D8F6-D8F7 - Defense

D8F8-D8F9 - Speed

D8FA-D8FB - Special

Pokémon 3

D8FC - Pokémon

D8FD-D8FE - Current HP

D8FF -

D900 - Status

D901 - Type 1

D902 - Type 2

D903 -

D904 - Move 1

D905 - Move 2

D906 - Move 3

D907 - Move 4

D908-D909 - Trainer ID

D90A-D90C - Experience

D90D-D90E - HP EV

D90F-D910 - Attack EV

D911-D912 - Defense EV

D913-D914 - Speed EV

D915-D916 - Special EV

D917 - Attack/Defense IV

D918 - Speed/Special IV

D919 - PP Move 1

D91A - PP Move 2

D91B - PP Move 3

D91C - PP Move 4

D91D - Level

D91E-D91F - Max HP

D920-D921 - Attack

D922-D923 - Defense

D924-D925 - Speed

D926-D927 - Special

Pokémon 4

D928 - Pokémon

D929-D92A - Current HP

D92B -

D92C - Status

D92D - Type 1

D92E - Type 2

D92F -

D930 - Move 1

D931 - Move 2

D932 - Move 3

D933 - Move 4

D934-D935 - Trainer ID

D936-D938 - Experience

D939-D93A - HP EV

D93B-D93C - Attack EV

D93D-D93E - Defense EV

D93F-D940 - Speed EV

D941-D942 - Special EV

D943 - Attack/Defense IV

D944 - Speed/Special IV

D945 - PP Move 1

D946 - PP Move 2

D947 - PP Move 3

D948 - PP Move 4

D949 - Level

D94A-D94B - Max HP

D94C-D94D - Attack

D94E-D94F - Defense

D950-D951 - Speed

D952-D953 - Special

Pokémon 5

D954 - Pokémon

D955-D956 - Current HP

D957 -

D958 - Status

D959 - Type 1

D95A - Type 2

D95B -

D95C - Move 1

D95D - Move 2

D95E - Move 3

D95F - Move 4

D960-D961 - Trainer ID

D962-D964 - Experience

D965-D966 - HP EV

D967-D968 - Attack EV

D969-D96A - Defense EV

D96B-D96C - Speed EV

D96D-D96E - Special EV

D96F - Attack/Defense IV

D970 - Speed/Special IV

D971 - PP Move 1

D972 - PP Move 2

D973 - PP Move 3

D974 - PP Move 4

D975 - Level

D976-D977 - Max HP

D978-D979 - Attack

D97A-D97B - Defense

D97C-D97D - Speed

D97E-D97F - Special

Pokémon 6

D980 - Pokémon

D981-D982 - Current HP

D983 -

D984 - Status

D985 - Type 1

D986 - Type 2

D987 -

D988 - Move 1

D989 - Move 2

D98A - Move 3

D98B - Move 4

D98C-D98D - Trainer ID

D98E-D990 - Experience

D991-D992 - HP EV

D993-D994 - Attack EV

D995-D996 - Defense EV

D997-D998 - Speed EV

D999-D99A - Special EV

D99B - Attack/Defense IV

D99C - Speed/Special IV

D99D - PP Move 1

D99E - PP Move 2

D99F - PP Move 3

D9A0 - PP Move 4

D9A1 - Level

D9A2-D9A3 - Max HP

D9A4-D9A5 - Attack

D9A6-D9A7 - Defense

D9A8-D9A9 - Speed

D9AA-D9AB - Special

Trainer Name

D9AC-D9B6 - Trainer name for 1st

D9B7-D9C1 - Trainer name for 2nd

D9C2-D9CC - Trainer name for 3rd

D9CD-D9D7 - Trainer name for 4th

D9D8-D9E2 - Trainer name for 5th

D9E3-D9ED - Trainer name for 6th

Nickname

D9EE-D9F8 - Nickname for 1st

D9F9-DA03 - Nickname for 2nd

DA04-DA0E - Nickname for 3rd

DA0F-DA19 - Nickname for 4th

DA1A-DA24 - Nickname for 5th

DA25-DA2F - Nickname for 6th

Etc.

Game Time

DA40 - Hours, two bytes

DA42 - Minutes, two bytes

DA44 - Seconds, one byte

DA45 - Frames, one byte

DA47 - Safari Balls

Stored Pokémon

This is for the current box that's in use.

DA80 - Number of Pokémon in current box

DA81-CA94 - Pokémon 1-20

DA95 - End of list

Pokémon 1

DA96 - Pokémon

DA97-DA98 - HP

DA99 - Level

DA9A - Status

DA9B-DA9C - Types

DA9D - Held Item (When traded to Generation II)

DA9E-DAA1 - Moves

DAA2-DAA3 - Trainer ID

DAA4-DAA6 - Experience

DAA7-DAA8 - HP EV

DAA9-DAAA - Attack EV

DAAB-DAAC - Defense EV

DAAD-DAAE - Speed EV

DAAF-DAB0 - Special EV

DAB1 - Attack/Defense IV

DAB2 - Speed/Special IV

DAB3-DAB6 - PP Moves

Pokémon 2

DAB7 - Pokémon

DAB8-DAB9 - HP

DABA - Level

DABB - Status

DABC-DABD - Types

DABE - Held Item (When traded to Generation II)

DABF-DAC2 - Moves

DAC2-DAC4 - Trainer ID

DAC4-DAC7 - Experience

DAC8-DAC9 - HP EV

DACA-DACB - Attack EV

DACC-DACD - Defense EV

DACE-DACF - Speed EV

DAD0-DAD1 - Special EV

DAD2 - Attack/Defense IV

DAD3 - Speed/Special IV

DAD4-DAD7 - PP Moves

Pokémon 3

DAD8 - Pokémon

DAD9-DADA - HP

DADB - Level

DADC - Status

DADD-DADE - Types

DADF - Held Item (When traded to Generation II)

DAE0-DAE3 - Moves

DAE4-DAE5 - Trainer ID

DAE6-DAE8 - Experience

DAE9-DAEA - HP EV

DAEB-DAEC - Attack EV

DAED-DAEE - Defense EV

DAEF-DAF0 - Speed EV

DAF1-DAF2 - Special EV

DAF3 - Attack/Defense IV

DAF4 - Speed/Special IV

DAF5-DAF8 - PP Moves

Pokémon 4

DAF9 - Pokémon

DAFA-DAFB - HP

DAFC - Level

DAFD - Status

DAFE-DAFF - Types

DB00 - Held Item (When traded to Generation II)

DB01-DB04 - Moves

DB05-DB06 - Trainer ID

DB07-DB09 - Experience

DB0A-DB0B - HP EV

DB0C-DB0D - Attack EV

DB0E-DB0F - Defense EV

DB10-DB11 - Speed EV

DB12-DB13 - Special EV

DB14 - Attack/Defense IV

DB15 - Speed/Special IV

DB16-DB19 - PP Moves

Pokémon 5

DB1A - Pokémon

DB1B-DB1C - HP

DB1D - Level

DB1E - Status

DB1F-DB20 - Types

DB21 - Held Item (When traded to Generation II)

DB22-DB25 - Moves

DB26-DB27 - Trainer ID

DB28-DB2A - Experience

DB2B-DB2C - HP EV

DB2D-DB2E - Attack EV

DB2F-DB30 - Defense EV

DB31-DB32 - Speed EV

DB33-DB34 - Special EV

DB35 - Attack/Defense IV

DB36 - Speed/Special IV

DB37-DB3A - PP Moves

Pokémon 6

DB3B - Pokémon

DB3C-DB3D - HP

DB3E - Level

DB3F - Status

DB40-DB41 - Types

DB42 - Held Item (When traded to Generation II)

DB43-DB46 - Moves

DB47-DB48 - Trainer ID

DB4A-DB4B - Experience

DB4C-DB4D - HP EV

DB4E-DB4F - Attack EV

DB50-DB51 - Defense EV

DB52-DB53 - Speed EV

DB54-DB55 - Special EV

DB56 - Attack/Defense IV

DB57 - Speed/Special IV

DB58-DB5B - PP Moves

Pokémon 7

DB5C - Pokémon

DB5D-DB5E - HP

DB5F - Level

DB60 - Status

DB61-DB62 - Types

DB63 - Held Item (When traded to Generation II)

DB64-DB67 - Moves

DB68-DB69 - Trainer ID

DB6A-DB6C - Experience

DB6D-DB6E - HP EV

DB6F-DB70 - Attack EV

DB71-DB72 - Defense EV

DB73-DB74 - Speed EV

DB75-DB76 - Special EV

DB77 - Attack/Defense IV

DB78 - Speed/Special IV

DB79-DB7C - PP Moves

Pokémon 8

DB7D - Pokémon

DB7E-DB7F - HP

DB80 - Level

DB81 - Status

DB82-DB83 - Types

DB84 - Held Item (When traded to Generation II)

DB85-DB88 - Moves

DB89-DB8A - Trainer ID

DB8B-DB8D - Experience

DB8E-DB8F - HP EV

DB90-DB91 - Attack EV

DB92-DB93 - Defense EV

DB94-DB95 - Speed EV

DB96-DB97 - Special EV

DB98 - Attack/Defense IV

DB99 - Speed/Special IV

DB9A-DB9D - PP Moves

Pokémon 9

DB9E - Pokémon

DB9F-DBA0 - HP

DBA1 - Level

DBA2 - Status

DBA3-DBA4 - Types

DBA5 - Held Item (When traded to Generation II)

DBA6-DBA9 - Moves

DBAA-DBAB - Trainer ID

DBAC-DBAE - Experience

DBAF-DBB0 - HP EV

DBB1-DBB2 - Attack EV

DBB3-DBB4 - Defense EV

DBB5-DBB6 - Speed EV

DBB7-DBB8 - Special EV

DBB9 - Attack/Defense IV

DBBA - Speed/Special IV

DBBB-DBBE - PP Moves

Pokémon 10

DBBF - Pokémon

DBC0-DBC1 - HP

DBC2 - Level

DBC3 - Status

DBC4-DBC5 - Types

DBC6 - Held Item (When traded to Generation II)

DBC7-DBCA - Moves

DBCB-DBCC - Trainer ID

DBCD-DBCF - Experience

DBD0-DBD1 - HP EV

DBD2-DBD3 - Attack EV

DBD4-DBD5 - Defense EV

DBD6-DBD7 - Speed EV

DBD8-DBD9 - Special EV

DBDA - Attack/Defense IV

DBDB - Speed/Special IV

DBDC-DBDF - PP Moves

Pokémon 11

DBE0 - Pokémon

DBE1-DBE2 - HP

DBE3 - Level

DBE4 - Status

DBE5-DBE6 - Types

DBE7 - Held Item (When traded to Generation II)

DBE8-DBEB - Moves

DBEC-DBED - Trainer ID

DBEE-DBF0 - Experience

DBF1-DBF2 - HP EV

DBF3-DBF4 - Attack EV

DBF5-DBF6 - Defense EV

DBF7-DBF8 - Speed EV

DBF9-DBFA - Special EV

DBFB - Attack/Defense IV

DBFC - Speed/Special IV

DBFD-DC00 - PP Moves

Pokémon 12

DC01 - Pokémon

DC02-DC03 - HP

DC04 - Level

DC05 - Status

DC06-DC07 - Types

DC08 - Held Item (When traded to Generation II)

DC09-DC0C - Moves

DC0D-DC0E - Trainer ID

DC0F-DC11 - Experience

DC12-DC13 - HP EV

DC14-DC15 - Attack EV

DC16-DC17 - Defense EV

DC18-DC19 - Speed EV

DC1A-DC1B - Special EV

DC1C - Attack/Defense IV

DC1D - Speed/Special IV

DC1E-DC21 - PP Moves

Pokémon 13

DC22 - Pokémon

DC23-DC24 - HP

DC25 - Level

DC26 - Status

DC27-DC28 - Types

DC29 - Held Item (When traded to Generation II)

DC2A-DC2D - Moves

DC2E-DC2F - Trainer ID

DC30-DC32 - Experience

DC33-DC34 - HP EV

DC35-DC36 - Attack EV

DC37-DC38 - Defense EV

DC39-DC3A - Speed EV

DC3B-DC3C - Special EV

DC3D - Attack/Defense IV

DC3E - Speed/Special IV

DC3F-DC42 - PP Moves

Pokémon 14

DC43 - Pokémon

DC44-DC45 - HP

DC46 - Level

DC47 - Status

DC48-DC49 - Types

DC4A - Held Item (When traded to Generation II)

DC4B-DC4E - Moves

DC4F-DC50 - Trainer ID

DC51-DC53 - Experience

DC54-DC55 - HP EV

DC56-DC57 - Attack EV

DC58-DC59 - Defense EV

DC5A-DC5B - Speed EV

DC5C-DC5D - Special EV

DC5E - Attack/Defense IV

DC5F - Speed/Special IV

DC60-DC63 - PP Moves

Pokémon 15

DC64 - Pokémon

DC65-CC66 - HP

DC67 - Level

DC68 - Status

DC69-DC6A - Types

DC6B - Held Item (When traded to Generation II)

DC6C-DC6F - Moves

DC70-DC71 - Trainer ID

DC72-DC74 - Experience

DC75-DC76 - HP EV

DC77-DC78 - Attack EV

DC79-DC7A - Defense EV

DC7B-DC7C - Speed EV

DC7D-DC7E - Special EV

DC7F - Attack/Defense IV

DC80 - Speed/Special IV

DC81-DC84 - PP Moves

Pokémon 16

DC85 - Pokémon

DC86-DC87 - HP

DC88 - Level

DC89 - Status

DC8A-DC8B - Types

DC8C - Held Item (When traded to Generation II)

DC8D-DC90 - Moves

DC91-DC92 - Trainer ID

DC93-DC95 - Experience

DC96-DC97 - HP EV

DC98-DC99 - Attack EV

DC9A-DC9B - Defense EV

DC9C-DC9D - Speed EV

DC9E-DC9F - Special EV

DCA0 - Attack/Defense IV

DCA1 - Speed/Special IV

DCA2-DCA5 - PP Moves

Pokémon 17

DCA6 - Pokémon

DCA7-DCA8 - HP

DCA9 - Level

DCAA - Status

DCAB-DCAC - Types

DCAD - Held Item (When traded to Generation II)

DCAE-DCB1 - Moves

DCB2-DCB3 - Trainer ID

DCB4-DCB6 - Experience

DCB7-DCB8 - HP EV

DCB9-DCBA - Attack EV

DCBB-DCBC - Defense EV

DCBD-DCBE - Speed EV

DCBF-DCC0 - Special EV

DCC1 - Attack/Defense IV

DCC2 - Speed/Special IV

DCC3-DCC6 - PP Moves

Pokémon 18

DCC7 - Pokémon

DCC8-DCC9 - HP

DCCA - Level

DCCB - Status

DCCC-DCCD - Types

DCCE - Held Item (When traded to Generation II)

DCCF-DCD2 - Moves

DCD3-DCD4 - Trainer ID

DCD5-DCD7 - Experience

DCD8-DCD9 - HP EV

DCDA-DCDB - Attack EV

DCDC-DCDD - Defense EV

DCDE-DCDF - Speed EV

DCE0-DCE1 - Special EV

DCE2 - Attack/Defense IV

DCE3 - Speed/Special IV

DCE4-DCE7 - PP Moves

Pokémon 19

DCE8 - Pokémon

DCE9-DCEA - HP

DCEB - Level

DCEC - Status

DCED-DCEE - Types

DCEF - Held Item (When traded to Generation II)

DCF0-DCF3 - Moves

DCF4-DCF5 - Trainer ID

DCF6-DCF8 - Experience

DCF9-DCFA - HP EV

DCFB-DCFC - Attack EV

DCFD-DCFE - Defense EV

DCFF-DD00 - Speed EV

DD01-DD02 - Special EV

DD03 - Attack/Defense IV

DD04 - Speed/Special IV

DD05-DD08 - PP Moves

Pokémon 20

DD09 - Pokémon

DD0A-DD0B - HP

DD0C - Level

DD0D - Status

DD0E-DD0F - Types

DD10 - Held Item (When traded to Generation II)

DD11-DD14 - Moves

DD15-DD16 - Trainer ID

DD17-DD19 - Experience

DD1A-DD1B - HP EV

DD1C-DD1D - Attack EV

DD1E-DD1F - Defense EV

DD20-DD21 - Speed EV

DD22-DD23 - Special EV

DD24 - Attack/Defense IV

DD25 - Speed/Special IV

DD26-DD29 - PP Moves

Trainer name

DD2A-DD34 - Trainer name for 1st

DD35-DD3F - Trainer name for 2nd

DD40-DD4A - Trainer name for 3rd

DD4B-DD55 - Trainer name for 4th

DD56-DD60 - Trainer name for 5th

DD61-DD6B - Trainer name for 6th

DD6C-DD76 - Trainer name for 7th

DD77-DD81 - Trainer name for 8th

DD82-DD8C - Trainer name for 9th

DD8D-DD97 - Trainer name for 10th

DD98-DDA2 - Trainer name for 11th

DDA3-DDAD - Trainer name for 12th

DDAE-DDB8 - Trainer name for 13th

DDB9-DDC3 - Trainer name for 14th

DDC4-DDCE - Trainer name for 15th

DDCF-DDD9 - Trainer name for 16th

DDDA-DDE4 - Trainer name for 17th

DDE5-DDEF - Trainer name for 18th

DDF0-DDFA - Trainer name for 19th

DDFB-DE05 - Trainer name for 20th

Nickname

DE06-DE10 - Nickname for 1st

DE11-DE1B - Nickname for 2nd

DE1C-DE26 - Nickname for 3rd

DE27-DE31 - Nickname for 4th

DE32-DE3C - Nickname for 5th

DE3D-DE47 - Nickname for 6th

DE48-DE52 - Nickname for 7th

DE53-DE5D - Nickname for 8th

DE5E-DE68 - Nickname for 9th

DE69-DE73 - Nickname for 10th

DE74-DE7E - Nickname for 11th

DE7F-DED9 - Nickname for 12th

DE8A-DE94 - Nickname for 13th

DE95-DE9F - Nickname for 14th

DEA0-DEAA - Nickname for 15th

DEAB-DEB5 - Nickname for 16th

DEB6-DEC0 - Nickname for 17th

DEC1-DECB - Nickname for 18th

DECC-DED6 - Nickname for 19th

DED7-DEE1 - Nickname for 20th

Internal data (HRAM)

When the game boots, HRAM (FF80 to FFFE) is initialized to 0.

OAM DMA

FF80-FF89 - OAM DMA routine

Misc.

FF8A - Soft reset frame counter
Initially has value 16.
Decremented each frame START+SELECT+A+B are held down ; when 0, the game soft resets.

FF9F-FFA1 - Money / Coins amount (big-endian)
When holding coins amount, 0 is written to FF9F for some reason.

Serial

FFA9-FFAD - Serial status data (sync method, etc.)

Graphics scroll values

FFAE - Value copied to SCX at VBlank
FFAF - Value copied to SCY at VBlank
FFB0 - Value copied to WY  at VBlank

Joypad

FFB1 - Joypad input during previous frame
FFB2 - Released buttons on this frame
FFB3 - Pressed buttons on this frame
FFB4 - Held buttons on this frame

FFB5 - Low-sensitivity joypad output, controlled by FFB6 and FFB7.
FFB6 - If zero and A or B is held, outputs nothing. Otherwise, considers buttons held for more than half a second being pressed twelve times a second.
Has no influence if FFB7 is zero.
FFB7 - If zero, FFB5 contains newly-pressed buttons only.

ROM banking

FFB8 - Loaded ROM bank.
FFB9 - Saved ROM bank.

VBlank data transfer

FFBA - Transfer background to VRAM during VBlank ?
FFBB - Which portion of the screen to transfer ? (0-1-2 = top-middle-bottom)

FFBC-FFBD - Where to copy background to ? (does not account for FFBB offset ; low-endian address)

FFBF-FFC0 - Stack pointer save

FFC1-FFC2 - Where to copy background from ? (used during copy ; low-endian address)
FFBA is copied to FFC1 (LSB of address).
FFC3-FFC4 - Where to copy background to ? (low-endian address)
FFC5 - Number of rows to copy

FFC6 - Number of 16-byte units to copy during VBlank
FFC7-FFC8 - Source
FFC9-FFCA - Destination

FFCB - Number of 8-byte units to copy during VBlank
FFCC-FFCD - Source
FFCE-FFCF - Destination

VBlank 2x2 tile block redraw

FFD0 - What to redraw (0-1-2 = nothing-column-row)
FFD1-FFD2 - Destination

RNG

FFD3 - RandomAdd
FFD4 - RandomSub

On each call to the Random function, the value of register rDIV (roughly tracking how many bytes were executed) and the carry are added to RandomAdd, and subtracted from RandomSub.

VBlank interface

FFD5 - Frame counter (decremented each VBlank)
FFD6 - Set to 0 when a VBlank occurs

Misc. 2

FFD7 - Tileset type (0-1-2 = indoors-cave-outside)
Nonzero values have the water animation.
Value 2 has the flower animation.

FFF3 - Battle turn (0-1 = player-opponent)

FFF8 - Joypad input
FFF9 - Diable joypad polling