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The door outside the Rock Peak Ruins reads:
|“||Let the first Pokémon hold a never-changing stone.||”|
The player must have their lead Pokémon holding a Water stone to open the door.
Inside the ruins, there are several light switches on the floor, resembling Regirock's eyes, similar to the counterpart in Sinnoh. By stepping across the switches, they can be turned on or off, and if all switches are turned on, the ground shakes and the statue on the north wall will activate. By interacting with the statue, Regirock is battled.
- The Rock Peak Ruins, along with the other ruins of the Legendary Giants, reference the past games: