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Line 6: 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]]. 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. 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).▼ 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). 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♂. ▲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). 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. Note that 39 [[Missingno.]] are found in the list between valid Pokémon, and the number of official Pokémon +39 equals 190; a round figure. According to [http://www.smogon.com/forums/threads/there-were-190-pok%C3%A9mon.78267/ a post from Zog on Smogon], Shigeki Morimoto confirmed that there were originally 190 Pokémon, and that the rest were saved for later. 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]].