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
...

Related articles

Game mechanics Evolution prevention • Devolution • Evolution move
Methods of Evolution Level-based Evolution • Evolution item (Evolution stone) • Trade Evolution • Friendship Evolution
Time-based Evolution • Gender-based Evolution • Move-based Evolution
Location-based Evolution • Region-based Evolution • Game-based Evolution
Lists of Pokémon Evolutionary line (GO) • No evolutionary line • Branched • Cross-generation • Levels
Methods of Evolution by index number (Gen I • Gen II • Gen III • Gen IV • Gen V • Gen VI • Gen VII • Gen VIII • Gen IX)
In spin-off games Evolution in Mystery Dungeon (items) • Evolution in Pinball (items)
Data structures Pokémon Evolution data structure (Gen III • Gen IV)
Data structure in the Pokémon games
General Character encoding
Generation I Pokémon species • Pokémon • Poké Mart • Character encoding (Stadium) • Save
Generation II Pokémon species • Pokémon • Trainer • Character encoding (Stadium • 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.
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