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TheUnknown Dungeon (Japanese:ななしの洞窟Nameless Cave) is a very smallcave in southernKalos that can be accessed fromPokémon Village. A soleMewtwo resides in the center with either theMewtwonite XX orMewtwonite YY. The Unknown Dungeon is only accessible toTrainers who enter theHall of Fame.Surf is needed to access the cave.
Its purpose as a place to catch Mewtwo is a direct reference toCerulean Cave inKanto. It also shares its name with the alternative moniker for Cerulean Cave used in Japanese releases of theGeneration I games.
The Unknown Dungeon is a tinycave whose entrance is found in the side of a mountain. The cave is barren in terms of terrain aside from the occasional water drop and the few rocks that dot the floor.Mewtwo awaits theplayer in the center of the cave, facing away from the entrance.
AMewtwo appears here on the first visit. If defeated or run from, it respawns after entering theHall of Fame. It is coded to never beShiny. After beingcaught, it will leave behind itsMewtwonite XX orMewtwonite YY, depending on the game.
The Unknown Dungeon appeared briefly inMalamar Traps, whereMewtwo was shown residing inside the cave, waiting to make its move againstTeam Flare, who had taken overPokémon Village and were capturing local Pokémon to be used as a new power source for theultimate weapon.
