In Pokémon Gameboy game, the Unknown Dungeon is a place where you can get only after you beat the Elite Four and your nemesis.

It can be found near Cerulean City - there's a river northwest of the city, and you need to surf down it from the north to get to the other side. Before you beat the enemies of yours, there's someone standing on the way.

You can find many high-level Pokémons in the cave, most interesting one of them is, of course, Mewtwo.

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