The Decolore Islands (Japanese: デコロラ諸島Decolora Archipelago) is an animated series-exclusive region consisting of a large chain of islands. It is located between Unova and Kanto.
This is the second archipelago region that Ash has visited, the first being the Orange Islands. However, unlike the Orange Islands, there is neither any type of League known to exist in the Decolore Islands nor any regional Professor.
This is also the only region in which neither Ash nor any other main character has caught a new Pokémon.
This is also the only archipelago to not include a villainous team.