Pokémon data structure (Generation II)

Pokémon
Species	byte
Held Item	byte
Attack 1	byte
Attack 2	byte
Attack 3	byte
Attack 4	byte
OT ID	word
Experience	3 bytes
EV data	10 bytes
DVs	word
PP1	byte
PP2	byte
PP3	byte
PP4	byte
Happiness	byte
Pokérus	byte
Caught data	word
Level	byte
Status	byte
?	byte
Current HP	word
Total HP	word
Attack	word
Defense	word
Speed	word
Sp. Attack	word
Sp. Defense	word

Pokémon in the Generation II games are all stored the same way in a 48-byte structure.

This structure is nearly the same as the Generation I structure, but with a few items moved around and the addition of four more bytes of data:

• Held Item
• Happiness
• Pokérus
• Special split: Special Defense and Special Attack

Notes

Caught data

The caught data is only used in Cianwood City where a woman tells the main character where a certain Pokémon was caught and at what time and level. This is two bytes:

• Location
• Time & Level

• 2 bits: Time of day (1: Morning, 2: Day, 3: Night)
• 6 bits: Level