From Bulbapedia, the community-driven Pokémon encyclopedia.
Each item has an index number that identifies it in any game. The following list enumerates them according to the way they are stored in the Generation III Game Boy Advance games.
Before Generation IV, the index number for a given item is not consistent between generations. For example, the Moon Stone in Generation II is index 8, but in Generation III it is index 94.
List
Rows highlighted in red indicate items introduced in Pokémon FireRed and LeafGreen, while rows highlighted in green were introduced in Pokémon Emerald.
Changes
Coming in to Generation III, the names of a few items were changed.
See also