Pokémon species data structure (Generation III)
Specs
A base stats structure is a 28-byte piece of data.
Every Pokémon species in the Generation III games has a 28-byte base stats structure stored in the game's ROM somewhere. It determines all information inherent to the species, such as base Sp. Defense, Types, Egg Groups, and EV yield.
| Base Stats | Data whose names are marked with an asterisk (*) have more information below the table. | |
|---|---|---|
| Name | Type | Description |
| Base HP | byte | The base HP used in calculating Pokémon of the species's HP. |
| Base Attack | byte | The base Attack used in calculating a Pokémon of the species's Attack. |
| Base Defense | byte | The base Defense used in calculating a Pokémon of the species's Defense. |
| Base Speed | byte | The base Speed used in calculating a Pokémon of the species's Speed. |
| Base Sp. Attack | byte | The base Sp. Attack used in calculating a Pokémon of the species's Sp. Attack. |
| Base Sp. Defense | byte | The base Sp. Defense used in calculating a Pokémon of the species's Sp. Defense. |
| Type 1* | byte | The first type of Pokémon of the species. |
| Type 2* | byte | The second type of Pokémon of the species. |
| Catch rate | byte | The catch rate used in calculating the probability that a wild Pokémon of the species will be caught. |
| Base Exp. yield | byte | The base Experience yield used in calculating how many Exp. points Pokémon who defeat another Pokémon of the species receives. |
| Effort yield* | word | How many EVs Pokémon who defeat another Pokémon of the species receives, and in what stats. |
| Item 1* | word | An item wild Pokémon of the species may hold. |
| Item 2* | word | Another item wild Pokémon of the species may hold. |
| Gender | byte | The value that is compared against the personality value of Pokémon of the species when determining what gender they will be, i.e. represents rate of females vs. males of the species. |
| Steps to hatch | byte | The cumulative number of steps that must be taken before an Egg of the species hatches, divided by 256. |
| Base Happiness | byte | The happiness/tameness at which Pokémon of the species have when first caught. |
| Level-up type | byte | The pattern of Experience which Pokémon of the species require to level up. |
| Egg group 1* | byte | Indicates an Egg Group that the species belongs to. |
| Egg group 2* | byte | Indicates another Egg Group that the species belongs to. |
| Ability 1 | byte | Indicates a special ability that Pokémon of the species may have. |
| Ability 2 | byte | Indicates another special ability that Pokémon of the species may have. |
| Safari Zone Rate | byte | Determines rate at which Pokémon of the species flee when encountered in the Safari Zone. Only Pokémon that appear in the Safari Zone have this set. |
| Color* | byte | The Pokémon's color. |
| 0000 | word | Padding. |
Notes
Types
Types are enumerated like this:
| 00. Normal | 01. Fighting | 02. Flying | 03. Poison | 04. Ground | 05. Rock |
| 06. Bug | 07. Ghost | 08. Steel | 09. ??? | 10. Fire | 11. Water |
| 12. Grass | 13. Electric | 14. Psychic | 15. Ice | 16. Dragon | 17. Dark |
Type 9 (???) can be an actual type for a species as well as a type for an attack. If the Pokémon only has one type, both Types will be set to the same value.
Effort yield
Certain bits count for particular stats:
(MSB) (LSB) 0000 11 11 11 11 11 11 empty SDF SAK SPD DEF ATK HP
Items
Items in the first "slot" have a 50% probability of being on the Pokémon, while 5% in the second "slot". If it's the same item in both then it's up to 100%.
Gender
Gender is zero for always-male Pokémon, 254 for always-female Pokémon and 255 for gender-neutral. Everything inbetween is a percentage value: Pikachu, 50% chance of being female, has 127.
Egg Groups
This determines with which type of Pokémon the Pokémon can breed to get eggs. See Egg groups. These are the direct values of the groups:
| 01. Monster | 02. Water 1 | 04. Bug | 05. Flying | 06. Ground |
| 07. Fairy | 08. Plant | 09. Humanshape | 10. Water 3 | 11. Mineral |
| 12. Indeterminate | 13. Water 2 | 14. Ditto | 15. Dragon | 16. No Egg |
Colors
Colors don't really affect any part of the game mechanics, but they are used in Pokédex search function; though the MSB bit is set on some Pokémon. Here is the list of the values and their relating colors:
| 00. Red | 01. Blue | 02. Yellow | 04. Green | 05. Black |
| 06. Brown | 07. Purple | 08. Gray | 09. White | 10. Pink |
Fingerprint
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 // ?????????? (used for unknown/glitch Pokémon) 2D 31 31 2D 41 41 0C 03 2D 40 00 01 00 00 00 00 1F 14 46 03 01 07 41 00 00 03 00 00 // BULBASAUR 3C 3E 3F 3C 50 50 0C 03 2D 8D 00 05 00 00 00 00 1F 14 46 03 01 07 41 00 00 03 00 00 // IVYSAUR 50 52 53 50 64 64 0C 03 2D D0 00 06 00 00 00 00 1F 14 46 03 01 07 41 00 00 03 00 00 // VENUSAUR 27 34 2B 41 3C 32 0A 0A 2D 41 40 00 00 00 00 00 1F 14 46 03 01 0E 42 00 00 00 00 00 // CHARMANDER 3A 40 3A 50 50 41 0A 0A 2D 8E 40 01 00 00 00 00 1F 14 46 03 01 0E 42 00 00 00 00 00 // CHARMELEON 4E 54 4E 64 6D 55 0A 02 2D D1 00 03 00 00 00 00 1F 14 46 03 01 0E 42 00 00 00 00 00 // CHARIZARD 2C 30 41 2B 32 40 0B 0B 2D 42 10 00 00 00 00 00 1F 14 46 03 01 02 43 00 00 01 00 00 // SQUIRTLE 3B 3F 50 3A 41 50 0B 0B 2D 8F 10 04 00 00 00 00 1F 14 46 03 01 02 43 00 00 01 00 00 // WARTORTLE 4F 53 64 4E 55 69 0B 0B 2D D2 00 0C 00 00 00 00 1F 14 46 03 01 02 43 00 00 01 00 00 // BLASTOISE ...
Storage
The following are ROM offsets for the first entry (Bulbasaur) in each GBA game (US version?):
- Ruby: 0x001fec34
- Sapphire: 0x001febc4
- Emerald: 0x002f0d70
- FireRed: 0x002111A8
- LeafGreen: 0x00211184
- LeafGreen (EN-US): 0x0025477C
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