Oddity Cave (Japanese: いへんの どうくつ Accidental Cave) is a dungeon in Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team that contains 15 floors. It cannot be accessed by normal means in the game and is only available through a Nintendo Event, using the Wonder Mail Code: ??MS CJ(...)? 44?P MF?8 7J6R (...)M?1. The Pokémon found in this dungeon are also found in Mt. Thunder, Frosty Forest, and Mt. Blaze.
Note: The % are rough estimates.