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Difference between revisions of "Identifier"
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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 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]] (Red/Blue and Yellow versions), the Pokémon's identifiers did not match the PokéDex numbers assigned to them (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]]).
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If the size of data is one byte, this usually means that the data can be represented by 256 index numbers (16^2 or 2^8). If the size is two bytes this would mean the data could be represented by 65536 index numbers (16^4 or 2^16) and so on.
  
An identifier is also referred to as a "[[hexadecimal|hex]]", due to the fact that identifiers are almost always represented in hexadecimal notation.
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An identifier is the value in a memory address, or the two digit number in the second and third digits of a GameShark or Xploder code/first two digits in a Game Boy Game Genie code (for example, in 01xx59D0, 010259D0 means the index number is 02).
  
==Identifiers by generation==
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In the [[bp:Generation I|first generation]] core games (Red/Green/Blue/Yellow versions), the Pokémon's identifiers did not match the Pokédex numbers assigned to them (e.g. Pokédex number 1 is assigned to Bulbasaur, while identifier 1 is assigned to Rhydon).
* [[Red/Blue/Yellow identifiers]]
 
* [[Gold/Silver/Crystal identifiers]]
 
* [[Ruby/Sapphire/Emerald/FireRed/LeafGreen identifiers]]
 
* [[Diamond/Pearl/Platinum/HeartGold/SoulSilver identifiers]]
 
  
[[Category: Terminology]]
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This is believed to be due to Pokémon being assigned to these numbers during game development (confirmed by a few Pokémon having them in the official Satoshi Tajiri: The Man Who Created Pokémon manga namely Diglett and Venonat). A few placeholder or unused entries remained in the final game, known as the [[MissingNo.]], which there are 39 of.
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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]].
 +
 
 +
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.
 +
 
 +
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 often represented in hexadecimal notation.
 +
 
 +
[[Category:Terminology]]

Latest revision as of 22:47, 31 May 2018

Bulbapedia also has an article about Identifier.
Wikipedia also has an article about Identifier.

"ID number" redirects here, for the player's ID number, or 'secret ID' please see Bulbapedia's respective article.

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 computer text.

If the size of data is one byte, this usually means that the data can be represented by 256 index numbers (16^2 or 2^8). If the size is two bytes this would mean the data could be represented by 65536 index numbers (16^4 or 2^16) and so on.

An identifier is the value in a memory address, or the two digit number in the second and third digits of a GameShark or Xploder code/first two digits in a Game Boy Game Genie code (for example, in 01xx59D0, 010259D0 means the index number is 02).

In the first generation core games (Red/Green/Blue/Yellow versions), the Pokémon's identifiers did not match the Pokédex numbers assigned to them (e.g. Pokédex number 1 is assigned to Bulbasaur, while identifier 1 is assigned to Rhydon).

This is believed to be due to Pokémon being assigned to these numbers during game development (confirmed by a few Pokémon having them in the official Satoshi Tajiri: The Man Who Created Pokémon manga namely Diglett and Venonat). A few placeholder or unused entries remained in the final game, known as the MissingNo., which there are 39 of.

The identifier, not the Pokédex number, must be used for cheat codes and in-game glitches like the Old Man Trick or Ditto Trick.

Later generations have Pokémon index numbers that match their Pokédex order, except for Generation III, which includes "?" 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.

Item identifiers are relatively constant throughout generations (i.e. item ID 1 is always the Master Ball).

An identifier is also referred to as a "hex", due to the fact that identifiers are often represented in hexadecimal notation.