Pokémon data structure (Generation I)
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Notes
| Pokémon | |
|---|---|
| Species | byte |
| Remaining HP | word |
| Level?? (See left) | byte |
| Status | byte |
| ? | 3 bytes |
| Attack 1 | byte |
| Attack 2 | byte |
| Attack 3 | byte |
| Attack 4 | byte |
| OT ID | word |
| Experience | 3 bytes |
| HP Up | byte |
| ? | byte |
| Protein | 1 byte |
| ? | byte |
| Iron | 1 byte |
| ? | byte |
| Carbos | byte |
| ? | 1 byte |
| Calcium | byte |
| ? | 1 byte |
| DVs | word |
| PP1 | byte |
| PP2 | byte |
| PP3 | byte |
| PP4 | byte |
| level | byte |
| Total HP | word |
| Attack | word |
| Defense | word |
| Speed | word |
| Special | word |
Pokémon in Generation I games are all stored in the same 44-byte structure.
The trainer EO is stored in other memory address.
Pokémon stored in a PC box use a shortened form of this structure that is 33-bytes in length, ending after the PP data. The Pokémon box data in Pokémon Yellow begins at 0xDA95 in memory (WRAM), and consists only of the currently open Pokémon box (this necessitates the need to save when switching open boxes). This box data is 660-bytes long (33-bytes * 20 Pokémon).
Species
This value is 1 byte length, and is the Pokémon Species.
The value for each Pokémon is listed in this article.
Remaining HP
This value is 2 bytes length.
Is the current level of HP remaining for this Pokémon. The value must not be greater than the total HP.
Level
1-byte in length. Though it appears to be the level of the Pokémon, it seems effectively redundant: Exists as a Pokémon's level when said Pokémon is stored in a PC box, yet is overwritten as part of the recalculation that takes place when the Pokémon is withdrawn. If the Pokémon is re-deposited back into a box, this value is set to the Pokémon's level again. This value's purpose is currently unknown.
Status
This value is 1 byte length, and is the status of the Pokémon:
0 = OK
4 = Sleep
8 = Poisson
10 = Burn
20 = Freezed
40 = Paralysis
OT ID
Is the ID of the trainer who catched the Pokémon. Is is different than ours, the Pokémon will gain extra experience.
Experience
Is the total amount of experience gained. The level of the Pokémon should be concordant with the experience amount. Visit the experience article for more information about Pokémon grow types, and experience formulas.
HP Up
This value informs about the amount of HP Up used in the Pokémon. Just because the number of HP Ups we can use with a Pokémon is limited.
Protein, Carbos, Iron, Calcium
The same as HP Up.
Total HP
Is the total HP the Pokémon can have when we visit a Pokémon Center.
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