Iron Ruins

The Iron Ruins is a special room in Iron Island in Pokémon Platinum. It is located in the cave system's exit room. It is called the Iron Ruins because it is the home of Registeel, the Iron Pokémon. Normally, if the player enters the cave, it is empty. However, after entering the Hall of Fame, if the player has a fateful encounter Regigigas in their party, there will be a 7-dot pattern on the floor and a statue on the back wall.