Type chart data structure (Generation III)

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

Format

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.

Notes

Types

Types are enumerated like this:

• 00. Normal
• 01. Fighting
• 02. Flying
• 03. Poison
• 04. Ground
• 05. Rock
• 06. Bug
• 07. Ghost
• 08. Steel
• 09. ???
• 10. Fire
• 11. Water
• 12. Grass
• 13. Electric
• 14. Psychic
• 15. Ice
• 16. Dragon
• 17. Dark

Effectiveness

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.

Fingerprint

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 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.