16. Pokémon Red/Blue: MissingNo.
As a glitch, MissingNo. is encountered when you travel up and down the east coast of Cinnabar Island in Surf mode. You’ll encounter a messed up graphical Pokémon, which leads to the item in the sixth slot of your inventory being multiplied exponentially. But just what is MissingNo. really? No one will ever know.
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