Pokémon Evolution data structure (Generation III)

Data on the Evolution of Pokémon is stored as a series of 6-byte structures in Generation III. These structures must be aligned on a 4-byte boundary, and each Pokémon species has 5 such entries, for a total of 40 bytes per species.

In all Generation III games, Evolution data is situated between the Pokémon move list data pool and the actual Pokémon move list index; see Move list data structures in Generation III for a list of locations.

Pokémon Evolution data structure

Each species has 5 substructures, as Eevee has 5 Evolution options in this generation. The overall structure is laid out as follows:

Offset	Size	Type	Notes
0x00	8	Substructure	First Substructure
0x08	8	Substructure	Second Substructure
0x10	8	Substructure	Third Substructure
0x18	8	Substructure	Fourth Substructure
0x20	8	Substructure	Fifth Substructure

Pokémon Evolution Data Substructure

The 6-byte substructure is organized as follows:

Offset	Size	Type	Notes
0x00	2	uint16_t	Method of Evolution - How this Pokémon will evolve. This can be one of the following values: 0x0001 - Evolves by friendship without regards to time of day 0x0002 - Evolves by friendship during the day 0x0003 - Evolves by friendship at night 0x0004 - Evolves by level up 0x0005 - Evolves by trade without items 0x0006 - Evolves by trading the Pokémon while holding an item 0x0007 - Evolves by using an item on the Pokémon 0x0008 - Evolves by level up, but only when Attack is greater than Defense 0x0009 - Evolves by level up, but only when Attack is equal to Defense 0x000A - Evolves by level up, but only when Attack is lower than Defense 0x000B - Evolves by level up, but only when the personality value permits (Wurmple → Silcoon Evolution) 0x000C - Evolves by level up, but only when the personality value permits (Wurmple → Cascoon Evolution) 0x000D - Evolves by level up, but may spawn another Pokémon if permitted (Nincada → Ninjask Evolution) 0x000E - Evolves by level up, but is only spawned if the conditions permit (Nincada → Shedinja Evolution) 0x000F - Evolves by beauty
0x02	2	uint16_t	Parameter - The meaning of this is dependent on the method of Evolution - the item, the level, etc. Not used and zeroed out where applicable. Note that the parameter is used for the beauty threshold, but is not used for the friendship threshold (which is always 220).
0x04	2	uint16_t	Target Pokémon - The Pokémon which this Pokémon will evolve to. See List of Pokémon by index number in Generation III for a list of values.
0x06	2	uint16_t	Padding due to alignment. Zeroed out.

All unused entries will be entirely zeroed-out.

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 00 00 00 00 00 00 00 00 00 00 00 00  // -
04 00 10 00 02 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 00 00 00 00 00 00 00  // BULBASAUR
04 00 20 00 03 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 00 00 00 00 00 00 00  // IVYSAUR
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 00 00 00 00 00 00 00 00 00 00 00 00  // VENUSAUR
04 00 10 00 05 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 00 00 00 00 00 00 00  // CHARMANDER
04 00 24 00 06 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 00 00 00 00 00 00 00  // CHARMELEON
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 00 00 00 00 00 00 00 00 00 00 00 00  // CHARIZARD
...

See also

Data structure in the Pokémon games General Character encoding Generation I Pokémon species • Pokémon • Poké Mart • Character encoding • Save Generation II Pokémon species • Pokémon • Trainer • Character encoding (Korean) • Save Generation III Pokémon species (Evolution • Pokédex • Type chart) Pokémon (substructures) • Move • Contest • Contest move • Item Trainer Tower • Battle Frontier • Character encoding (GameCube) • Save Generation IV Pokémon species (Evolution • Learnsets) Pokémon • Save • Character encoding (Wii) Generation V–present Character encoding Generation VIII Save TCG GB and GB2 Character encoding

This data structure article is part of Project Games, a Bulbapedia project that aims to write comprehensive articles on the Pokémon games.