The last of the seven Sevii Islands. Quest Island is the most natural of the islands and is very hard to traverse as such. To the south of the port town, lies Seavault Canyon, a long winding path that eventually leads to Tanoby Ruins, another home to Unown similar to Johto's Ruins of Alph. To the north of the town is the Trainer Tower, a challenging course for Trainer's to battle through.

Quest Island is accessible by ferry from Vermillion City, Olivine City, or any of the other Sevii Islands.