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'''Missing Number''' (Japanese: '''けつばん''' ''Ketsuban'', lit. "Missing Number"), displayed in-game as '''MissingNo.''', refers to a group of glitch Pokémon that act as fillers for vacant slots. Three particular examples also serve a specific purpose throughout the game; as the Kabtops Fossil, the Aerodactyl Fossil, and Pokémon Tower Ghost.
 
Most data pertaining to MissingNo. is clearly glitched and unintentional (evenand itsthere spriteis no error prevention, unlike laterfor example the examplessprites of Generation III glitch Pokémon like [[??????????]]) is clearly glitched and unintentional, but [[Partially unused and glitched|curiously some data]] like nine of the MissingNo. cries are leftover development remnants. The index numbers for "MissingNo." entries appear in between valid Pokémon, and combined they add up to 190 entries (151 valid Pokémon+39 MissingNo.). While technically there can be 256 indexed species (2^8 entries in one byte), the other glitch Pokémon only exist after Victreebel (190) with names not programmed into the game but extrapolated from unrelated data beyond [https://github.com/pret/pokered/blob/2954013da1f10e11db4ec96f9586b7c01706ae1a/data/pokemon/names.asm MonsterNames] encoded as if they were Pokémon names. ([[GlitchDex/RB:000|'M (00)]]/[[GlitchDex/Y:000|3TRAINERPOKé₽ (00)]] can be interpreted as both the index 256 or index 0 Pokémon).
 
All MissingNo. are Pokédex number ([[Glitch Pokémon family|family]]) 0, which is coincidentally the same Pokédex number as 'M (00). However, only (English versions) 'M (00)/|3TRAINERPOKé₽ (00) are [[index number]] 0 (when distinguished from the Pokédex number, and some index number 0 Pokémon have non-0 Pokédex numbers, such as 176 for 3TRAINERPOKé₽).
MissingNo. is among the most well-known Pokémon glitches in the English player base, likely because it can be encountered through simple glitches and provide a means to duplicate items (see [[glitch Pokédex flags]]). It is also visually similar to [[GlitchDex/RB:000|'M (00)]].
 
MissingNo. is among the most well-known Pokémon glitches in the English player base, likely because it can be encountered through simple glitches and provide a means to duplicate items (see [[glitch Pokédex flags]]). It is also visuallytypically but not always, appears similaridentical to [[GlitchDex/RB:000|'M (00)]].
The earliest mention of MissingNo. by Nintendo of America was on the May 1999 issue of Nintendo Power where it warned that "any contact with it (even if you don't catch it), could easily erase your game file or disrupt your graphics". It was later featured among other support notes for Pokémon Red and Blue on the company's Nintendo.com website as early as 2000 ([https://web.archive.org/web/20000302133233/http://www.nintendo.com/consumer/technical/repair/pakrepairdetails.html#missingno link]), where it is described as a "programming quirk", "not a real part of the game", and "most often found after you perform the [[Left-facing shore tile glitch|Fight Safari Zone Pokémon trick]]". Despite these official statements, MissingNo. is a relatively safe glitch Pokémon.
 
Coincidentally, both MissingNo. and 'M (00) are common with the [[left-facing shore tile glitch]]/[[old man glitch]]. These were among the earliest known glitches. In the Japanese player base (where the left-facing shore tile glitch is impossible), the [[Select glitch]] (exclusive to Red/Green/Blue) and [[Trainer escape glitch]] (accessible in both Japanese and international versions but typically referred to as "fifth" in the Japanese player base), as well as [[Move 0x00 corruption (Generation I)|move 0x00 corruption]] (all versions but easy to set up with Select glitch or Red and Blue using a move swap on an opponent with more than one move with Ditto and Transform), or [[unterminated name glitch item instant encounter]] (provided the front sprite is not problematic) are typically used in its place. In the Japanese player base, [[GlitchDexJP/RG:255|アネ゙デパミ゙ (FF)]] is also similarly well-known (in comparable popularity to MissingNo. and 'M), and can easily be seen replacing the first Pokémon with the [[dokokashira door glitch]]. The Japanese equivalent to 'M (00) is [[GlitchDexJP/RG:000|ィ゙ゃゾA]] (also Pokédex number 0).
 
The earliest mention of MissingNo. by Nintendo of America was on the May 1999 issue of Nintendo Power where it warned that "any contact with it (even if you don't catch it), could easily erase your game file or disrupt your graphics". It was later featured among other support notes for Pokémon Red and Blue on the company's Nintendo.com website as early as 2000 ([https://web.archive.org/web/20000302133233/http://www.nintendo.com/consumer/technical/repair/pakrepairdetails.html#missingno link]), where it is described as a "programming quirk", "not a real part of the game", and "most often found after you perform the [[Left-facing shore tile glitch|Fight Safari Zone Pokémon trick]]". DespiteHowever, thesethe officialJapanese statements,player MissingNo.base isknew aabout relativelyMissingNo. safebefore glitch Pokémonthis.
 
Despite these official statements, MissingNo. is a relatively safe glitch Pokémon in English Pokémon Red and Blue, but other versions may feature problematic front or back sprites of non-fossil Ghost/MissingNo. that could potentially harm the save file due to a [[game freeze]].
 
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