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Pokémon evolution data structure in Generation III

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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. The overall structure is laid out as follows:

Offset Size Type Notes
0x00 6 Substructure First Substructure
0x06 2 Padding due to alignment
0x08 6 Substructure Second Substructure
0x0E 2 Padding due to alignment
0x10 6 Substructure Third Substructure
0x16 2 Padding due to alignment
0x18 6 Substructure Fourth Substructure
0x1E 2 Padding due to alignment
0x20 6 Substructure Fifth Substructure
0x26 2 Padding due to alignment

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 (WurmpleSilcoon evolution)
  • 0x000C - Evolves by level up, but only when the personality value permits (WurmpleCascoon evolution)
  • 0x000D - Evolves by level up, but may spawn another Pokémon if permitted (NincadaNinjask evolution)
  • 0x000E - Evolves by level up, but is only spawned if the conditions permit (NincadaShedinja 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 friendship thresholds.
0x04 2 uint16_t Target Pokémon - The Pokémon which this Pokémon will evolve to. See List of Pokémon by index number (Generation III) for a list of values.

All unused entries will be entirely zeroed-out.


Data structure in the Pokémon games
Generation I Pokémon data structurePokémon base stats data structureSave data structure
Generation II Pokémon data structurePokémon base stats data structureTrainer data structureSave data structure
Generation III Pokémon data structurePokémon data substructuresPokémon base stats data structureMove data structure
Contest data structureContest move data structureItem data structurePokédex data structureBattle Frontier data structures
Trainer Tower data structuresPokémon evolution data structureType Chart data structureSave data structure
Generation IV Pokémon data structureSave data structure

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