From Bulbapedia, the community-driven Pokémon encyclopedia.
The Summit Ruins (Japanese: 山の遺跡 Mountain Ruins) are ruins that are located near the Pokémon Summer Academy and Mt. Coronet. It was featured in Ghoul Daze!, as one of the activities of the academy included the students pairing off in teams and retrieving a medal hidden in the ruins.
A recent construction accident at the ruins revealed a secret cave believed to be an entrance to the Ghost World. A ghost girl emerged from the open portal and tried to lure people into the Ghost World, but was fortunately prevented from doing so by a wild Dusknoir. After it pushed the ghost back into the portal, the ruins collapsed, sealing the portal.
Pokémon seen around the Summit Ruins
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