Sinjoh Ruins

3 Pokémon can be caught at Sinjoh Ruins in Johto.

The Sinjoh Ruins appear in HeartGold and SoulSilver and belong to no known region. Their centerpiece is the Mystri Stage, a triangular platform inside a ruined temple. Reaching them requires walking with an Arceus from an event distribution, or one the game treats as traded from the Hall of Origin, into the Ruins of Alph; since the Azure Flute was never distributed in Generation IV, a Hall of Origin Arceus cannot be obtained legitimately.