Answer 1

Missingno is a glitch "pokemon" that existed in the classic games. It could be use to level pokemon beyond 100, get good items, etc. But it risked ruining your game.

Comments

Yeah I kinda glitched my game by accidentally duplicating the bicycle instead of masterballs, then tried to put the bike in the PC but it kept putting it in a different slot and I filled up the PC and had hardly any space for items :(

Answer 2

Missingno is this wierd thing you can find in Red and blue Version. It does weird stuff to your pokemon like turn them into other things and make them learn wierd moves. It's considered a glitch, and nintendo fixed it for FR/LG.