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In the Pokémon games, an '''identifier''' (also '''index number''' or '''ID number''') is a number used within the game's code to identify pieces of data. Pokémon, items, locations, moves, and abilities all have unique identifiers; in each game, no two Pokémon have the same identifier. Pieces of data in different categories, however, may share identifiers -- a Pokemon and an item may use the same identifier, for instance. Identifiers may be likened to character codes in [[Wikipedia:Character encoding|computer text]].
 
In the [[bp:Generation I|first generation]] core games (Red/Green/Blue and /Yellow versions), the Pokémon's identifiers did not match the PokéDexPokédex numbers assigned to them (PokéDexe.g. Pokédex number 1 is assigned to Bulbasaur, while identifier 1 is assigned to Rhydon). The identifier, not the PokéDex number, must be used for [[cheating device|cheat codes]] and in-game tricks like the [[Old Man Trick]] or [[Ditto Trick]]. This was fixed in the [[bp:Generation II|second generation]]. Item identifiers are relatively constant throughout generations (i.e. item ID 1 is always the [[bp:Master Ball|Master Ball]]).
 
The index number ordering is believed to reflect the order that Pokémon were programmed into the game (except for Mew; hex:15, who was actually a '[https://archive.today/te3z1 last minute]' addition to the game), and this is supported by [http://www.glitterberri.com/pokemon-red-blue/game-freak-staff-interview/creating-the-pokemon/ an interview] ([http://www.nintendo.co.jp/nom/0007/gfreak/page01.html original Japanese version]) that states Rhydon was the first Pokémon ever made. However, Ken Sugimori lists Clefairy and Lapras after Rhydon, while index numbers 2 and 3 are used for Kangaskhan and Nidoran♂.
An identifier is also referred to as a "[[hexadecimal|hex]]", due to the fact that identifiers are almost always represented in hexadecimal notation.
 
The identifier, not the Pokédex number, must be used for [[cheating device|cheat codes]] and in-game glitches like the [[Old Man Trick]] or [[Ditto Trick]].
==Identifiers by generation==
* [[Red/Blue/Yellow identifiers]]
* [[Gold/Silver/Crystal identifiers]]
* [[Ruby/Sapphire/Emerald/FireRed/LeafGreen identifiers]]
* [[Diamond/Pearl/Platinum/HeartGold/SoulSilver identifiers]]
 
Later generations have Pokémon index numbers that match their Pokédex order, except for [[bp:Generation III|Generation III]], which includes "[[? (glitch Pokémon)|?]]" [[glitch Pokémon]] in between the index numbers of Celebi and Treecko, and certain Pokémon in an earlier or later order, such as the Ralts line existing later on in the internal ordering, grouped before the Bagon family.
[[Category: Terminology]]
 
Item identifiers are relatively constant throughout generations (i.e. item ID 1 is always the [[bp:Master Ball|Master Ball]]).
 
An identifier is also referred to as a "[[hexadecimal|hex]]", due to the fact that identifiers are almost alwaysoften represented in hexadecimal notation.
 
[[Category: Terminology]]
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