From Bulbapedia, the community-driven Pokémon encyclopedia.
Ogi Isle (Japanese: 沖島 Oki Isle) is the northernmost isle in the Whirl Islands archipelago. It is an anime-exclusive area located off the northwestern tip of Silver Rock Isle, almost to Olivine City. The two islands are connected to each other via an underwater tunnel.
Ogi Isle is home to a family of Lugia.