From Bulbapedia, the community-driven Pokémon encyclopedia.
Chrysanthemum Island (Japanese: ユズリハ島 Yuzuriha Island) is an anime-exclusive location found in Kanto. It is located between Fuchsia City and the Seafoam Islands.
It was featured as the setting in Spontaneous Combusken!. Among the town's attractions are a beach, which is thought to be a vacation spot or a tourist location. On the beach is a Contest Hall, which May and Brianna participated in.
Pokémon seen on Chrysanthemum Island