Unknown Dungeon

Unknown Dungeon can refer to four different locations:

Cerulean Cave, a cave in the Kanto region.
Nameless Cavern, a cave in the Hoenn region in Pokémon Omega Ruby and Alpha Sapphire.
Unknown Dungeon (Kalos), a cave in the Kalos region.
Unknown Dungeon (Mystery Dungeon), a wireless feature in Pokémon Mystery Dungeon: Blue Rescue Team.

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