Treasure Island is an animated series-exclusive island in the Alola region. It is located near Melemele Island and is uninhabited by humans; however, it is home to many wild Pokémon. Treasure Island was visited by Ash and his Pikachu in Partner Promises! following the recommendation of a saleswoman, who mentions that the island is full of wild Pokémon as well as materials to help make accessories for her shop. Ash and Pikachu spend most of the day there, where they played with the local Pokémon.