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[[Image:Wild MissingNo.png|thumb|A typical encounter with MissingNo.]]
{{Cleanup}}▼
'''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.
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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 also typically but not always, appears identical to [[GlitchDex/RB:000|'M (00)]].
==Access and discovery==
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).▼
Coincidentally, both MissingNo. and 'M (00) are common with the [[left-facing shore tile glitch]]/[[old man glitch]], and these were among the earliest known glitches in the English player base. In the English versions of Pokémon Red and Blue (unlike other versions like English Pokémon Yellow) the unused [[Bird type|Bird-type]] also belongs to MissingNo. and 'M (00), meaning the Bird-type was an example of unused content in the Pokémon games known early on.
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In the French, German, Italian and Spanish versions, the left-facing shore tile glitch was partially patched in the Italian and Spanish versions of Red and Blue. The Italian and Spanish versions require using [[walk through walls]] on the coast instead of Surfing. In all versions of Pokémon Yellow, the old man glitch was also fixed. For the affected versions, this (and versions where MissingNo.'s front sprite freezes) made the accessibility of finding MissingNo. harder, but it can still be encountered with the Trainer escape glitch in all versions. Additionally, the Spanish and Italian versions have their own [[Grass/rock Surfing glitch|exclusive glitch]] for finding MissingNo. or 'M (00), which some native Italian and Spanish players have exploited.
Sometimes, specifically for Fossil and Ghost MissingNo. (182-184) because they bypass a freezing front sprite while still duplicating the sixth item, players for versions such as Pokémon Yellow (English) will use a sub-glitch such as the Ditto glitch or a chain of encounters when [[Trainer escape glitch#Trade NPC Pokémon and resulting Pokémon|speaking with a trade NPC before returning to the route]]) to access Special stats as high as 182-184.
==Acknowledgement by Nintendo of America==
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 Fight Safari Zone Pokémon trick". However, the Japanese player base knew about MissingNo. before this.
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]].
▲{{Cleanup}}
==Details==
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The sprites and core data of MissingNo. varies between versions (Red/Blue, Yellow and each of their localizations, in addition to the Japanese Red/Green and Japanese Blue), but its Pokédex category is common across all variants, being classified as the "???" Pokémon. Some of the MissingNo. have sprites which may [[game freeze|freeze]] the game (although not necessarily), such as the front sprite of regular MissingNo. in the English Yellow version.
The
Upon catching MissingNo., its Pokédex entry will be shown if the player has not seen Cubone, and this will activate the [[Rhydon trap]]. Otherwise, the Pokédex entry will not be shown and the MissingNo. will not be turned into a Rhydon.
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*[[Time Capsule exploit]]:- with Scizor, Shuckle, Heracross, Sneasel, Teddiursa, Ursaring, Slugma, Magcargo, Swinub, Piloswine, Corsola, Remoraid, Octillery, Delibird, Mantine, Skarmory, Houndour, Houndoom, Kingdra, Phanpy, Donphan, Porygon2, Stantler, Smeargle, Tyrogue, Hitmontop, Smoochum, Elekid, Magby, Miltank, Blissey, Raikou, Entei, Suicune, Larvitar, or Ho-Oh.
*[[Arbitrary code execution#Using 8F (Red/Blue)|Arbitrary code execution with 8F]].
*[[TMTRAINER effect|TMTRAINER effect via '-' (move 0x00 corruption)]] (when sprites are not flipped).
===''Pokémon Red & Blue'' (Italian/Spanish)===
*[[Grass/rock Surfing glitch]] (exclusive to these versions without more complex modifications; see [[8 8 (0x7C) grass/rock surfing glitch]] and [[submerge glitch]]).
*Other international glitches where applicable (does not include old man glitch).
====Via evolutions====
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*[[Remaining HP glitch]]:- with one of the following remaining HP values (if the value is greater than 255, take a modulo 256): 31, 32, 50, 52, 56, 61, 62, 63, 67, 68, 69, 79, 80, 81, 86, 87, 94, 95, 115, 121, 122, 127, 134, 135, 137, 140, 146, 156, 159, 160, 161, 162, 172, 174, 175 or 181.
*[[Time Capsule exploit]]:- with Scizor, Shuckle, Heracross, Sneasel, Teddiursa, Ursaring, Slugma, Magcargo, Swinub, Piloswine, Corsola, Remoraid, Octillery, Delibird, Mantine, Skarmory, Houndour, Houndoom, Kingdra, Phanpy, Donphan, Porygon2, Stantler, Smeargle, Tyrogue, Hitmontop, Smoochum, Elekid, Magby, Miltank, Blissey, Raikou, Entei, Suicune, Larvitar, or Ho-Oh.
*[[Arbitrary code execution#Using "ws m" (Yellow)|Arbitrary code execution e.g. with ws m]].
*[[TMTRAINER effect|TMTRAINER effect via '-']] (when sprites are not flipped).
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===''Pokémon Red'', ''Green'', ''Blue'' (Japanese)===
*"Fifth" (Ditto trick/Trainer-Fly variation
*[[TMTRAINER effect|TMTRAINER effect via '-']] (move 0x00 corruption) (when sprites are not flipped).
*[[Unterminated name glitch item instant encounter]].
*[[Arbitrary code execution
*Spawning it directly in the party with a [[Select glitch]] (does not duplicate items).
*[[Fossil conversion glitch]] (with a current experience modulo 256 of 31, 32, 50, 52, 56, 61, 62, 63, 67, 68, 69, 79, 80, 81, 86, 87, 94, 95, 115, 121, 122, 127, 134, 135, 137, 140, 146, 156, 159, 160, 161, 162, 172, 174, 175 or 181.
*Other internationally occurring glitches which also apply to Red/Green/Blue (Japanese) (does not include old man glitch).
▲*[[Arbitrary code execution#Using てヘ (tehe) in JP Red/Green|Arbitrary code execution with てヘ (tehe)]].
==Data==
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