Altar of the Sunne

Altar of the Sunne is a location on Poni Island in Alola, located at the far end of Vast Poni Canyon. While ordinarily it is only accessible in Pokémon Sun and Pokémon Ultra Sun, it can be accessed in Pokémon Moon and Pokémon Ultra Moon after becoming Champion by traveling through the Ultra Wormhole in the Altar of the Moone. During the story of Pokémon Sun, the player travels to Ultra Space from the Altar of the Sunne using Solgaleo's power.