EX Dragon Frontiers is the fifteenth Pokémon Trading Card Game set released by Pokémon USA. It is based on an unknown set of islands far away, inhabited primarily by Dragon Pokémon (thus making it likely that these islands are the Dragon Frontiers). It marks the final appearance of Delta Species Pokémon, after they debuted in EX Delta Species and returned in EX Holon Phantoms and EX Crystal Guardians, as well as a brief appearance in EX Legend Maker.