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 VNintendo DS games.
Since Generation IV, items may be introduced at new or unused indices, but they are never removed.
List
Rows highlighted in black indicate items exclusive to Pokémon Black and White, while rows highlighted in pink indicate items introduced in Pokémon Black 2 and White 2 (or exclusive to it if next to a row with the same index).
Coming into Generation V, the sprites of a few items changed. The Xtransceiver sprites were also updated between Black and White and Black 2 and White 2 (seen above).
While the blank items in the middle of the list can be displayed, the "items" after the last item in the list cannot. The list can be viewed in-game if such item exists in the save file, but these items are unnamed and the game crashes when selected.
This article is part of both Project ItemDex and Project Games, Bulbapedia projects that, together, aim to write comprehensive articles on the items in the Pokémon world and the Pokémon games, respectively.