Type chart data structure (Generation III)

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The type chart in the Generation III Pokémon games are stored in a 336-byte data structure.


The data structure consists of 112 3-byte entries, all of which use the following format. Data whose names are marked with an asterisk (*) have more information below the table.

Name Type Description
Attacking Type* byte The type of the move being used.
Defending Type* byte The type of the Pokémon being attacked.
Effectiveness* byte Used to determine the Damage multiplier.



Types are enumerated like this:


Hex Dec Description
0x00 0 Totally ineffective, such as Electric on Ground.
0x05 5 Not very effective, such as Water on Grass.
0x14 20 Supereffective, such as Ice on Dragon

Normally effective attacks, such as Bug on Normal, assume a default value of 0x0A (10), so they don't need to be listed in this table.

Foresight and Odor Sleuth

Near the end of the data structure, there are three bytes that signal the end of the normal part of the table - FE FE 00. There are only two entries after this, and they are Fighting and Normal on Ghost, respectively.

However, this area of the table is unique in that all entries in it are ignored after Foresight or Odor Sleuth is used, simply reverting to normal damage.

The end of the table is marked with FF FF 00.


00 05 05  // Normal -> Rock     (Not very effective)
00 08 05  // Normal -> Steel    (Not very effective)
0A 0A 05  // Fire   -> Fire     (Not very effective)
0A 0B 05  // Fire   -> Water    (Not very effective)
0A 0C 14  // Fire   -> Grass    (Super effective)
0A 0F 14  // Fire   -> Ice      (Super effective)
0A 06 14  // Fire   -> Bug      (Super effective)
0A 05 05  // Fire   -> Rock     (Not very effective)
0A 10 05  // Fire   -> Dragon   (Not very effective)
0A 08 14  // Fire   -> Steel    (Super effective)
0B 0A 14  // Water  -> Fire     (Super effective)

Data structure in the Pokémon games
General Character encoding
Generation I Pokémon speciesPokémonPoké MartCharacter encodingSave
Generation II Pokémon speciesPokémonTrainerCharacter encoding (Korean) • Save
Generation III Pokémon species (Pokémon evolutionPokédexType chart)
Pokémon (substructures) • MoveContestContest moveItem
Trainer TowerBattle FrontierCharacter encodingSave
Generation IV Pokémon species (Pokémon evolutionLearnsets)
PokémonSaveCharacter encoding
Generation V–present Character encoding
Generation VIII Save
TCG GB and GB2 Character encoding

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.