In the original games, 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. In the remake, it is unlocked after completing Mt. Steel.