From Bulbapedia, the community-driven Pokémon encyclopedia.
The Unknown Dungeon (Japanese: ななしの洞窟 Nameless Cave) is a very small cave in southern Kalos that can be accessed from Pokémon Village. A sole Mewtwo resides in the center with a game-specific Mewtwonite. The Unknown Dungeon is only accessible to Trainers who defeat the Pokémon League. Surf is needed to be able to reach the cave.
Its purpose as a place to catch Mewtwo is a direct reference to Cerulean Cave in Kanto. It also shares the name with the alternative moniker for Cerulean Cave used in all language releases of the Generation I games.
Geography
The Unknown Dungeon is a tiny cave 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 the player in the center of the cave, facing backwards.
Items
Pokémon
Pokémon
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Games
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Location
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Levels
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Rate
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Special Pokémon
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X
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Y
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Only one
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70
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One
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A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
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In other languages