View source for Pokémon species data structure (Generation III)

==Specs==

A '''base stats structure''' is a 28-byte piece of data. 

Every [[Pokémon|Pokémon species]] in the [[Generation III]] {{pkmn|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, [[Elemental types|Types]], [[Egg Groups]], and [[Effort values|EV yield]].

{| align="center" style="border: 1px solid #88a; background: #f8f8ff; padding: 0.5em;" cellspacing="3"
|- 
! style="text-align: center; background: #ccf;" | '''Base Stats''' || colspan="2" style="text-align: center; background: #ccf;" | 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 [[stats|HP]].
|-
| Base Attack || byte || The base Attack used in calculating a Pokémon of the species's [[stats|Attack]].
|-
| Base Defense || byte || The base Defense used in calculating a Pokémon of the species's [[stats|Defense]].
|- 
| Base Speed || byte || The base Speed used in calculating a Pokémon of the species's [[stats|Speed]].
|-
| Base Sp. Attack || byte || The base Sp. Attack used in calculating a Pokémon of the species's [[stats|Sp. Attack]].
|-
| Base Sp. Defense || byte || The base Sp. Defense used in calculating a Pokémon of the species's [[stats|Sp. Defense]].
|-
| [[Elemental types|Type 1]]* || byte || The first type of Pokémon of the species.
|-
| [[Elemental types|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. 
|-
| [[Experience| 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 values|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.
|-
| [[Personality value#Gender|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 [[Pokémon breeding|Egg]] of the species hatches, divided by 256.
|-
| Base [[Happiness]] || byte || The happiness/tameness at which Pokémon of the species have when first caught.
|-
| [[Experience|Level-up type]]* || byte || A number from 0 to 5 representing fhe pattern of experience which Pokémon of the species require to level up.
|-
| [[Egg groups|Egg group]] 1* || byte || Indicates an Egg Group that the species belongs to.
|-
| [[Egg groups|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 '''Type'''s will be set to the same value.

===Effort yield===

Certain bits count for particular stats:
<pre>
(MSB)                    (LSB)
 0000  11  11  11  11  11  11
empty SDF SAK SPD DEF ATK  HP
</pre>

===Items===
Items in the first &quot;slot&quot; have a 50% probability of being on the Pokémon, while 5% in the second &quot;slot&quot;. 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.

===Level-up Type===
The level-up types are enumerated like this:
{|style="border: 1px solid #88a; padding: 0.5em;" cellspacing="9"
|0.
|Medium Fast (1,000,000)
|-
|1.
|Erratic (600,000)
|-
|2.
|Fluctuating (1,640,000)
|-
|3.
|Medium Slow (1,059,860)
|-
|4.
|Fast (800,000)
|-
|5.
|Slow (1,250,000)
|}

===Egg Groups===
This determines with which type of Pokémon the Pokémon can breed to get eggs. See [[Egg groups|Egg groups]]. These are the direct values of the groups:

{| style="border: 1px solid #88a; padding: 0.5em;" cellspacing="3"
|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. The MSB bit determines whether or not the Pokémon's image is flipped on its Summary screen, though it's only really used for {{p|Unown}}.
Here is the list of the values and their relating colors:
{| style="border: 1px solid #88a; padding: 0.5em;" cellspacing="3"
|00. Red
|01. Blue
|02. Yellow
|04. Green
|05. Black
|-
|06. Brown
|07. Purple
|08. Gray
|09. White
|10. Pink
|}

==Fingerprint==

<pre>
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
...
</pre>

==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
{{data structure}}