The infamous Pokémon MissingNo is not supposed to exist, it's a programming glitch and was never intended to be in the game. That being said there are no mistakes, just happy accidents, something like that anyway. Is MissingNo acknowledged as existing as part of the lore? I think that would be interesting, personally.
Does MissingNo exist ‘canonically’
pokemon-series
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Best Answer
MissingNo. is not a Pokémon, it's not something that was never intended to be in the game. It is random data found in memory that is misread by the game, which believes a Pokémon should be there.
Nintendo's customer service for the GameBoy has a specific section about MissingNo., which says the following:
Even Nintendo calls it just a "programming quirk", it is not an entity whose "canonicity" can be confirmed or denied.