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A Double Battle is when a Trainer uses two Pokémon to battle. A tag battle is where two trainers battle together. Double Battles are mostly seen in Grand Festivals, Double Performance Contests, Pokémon Leagues, etc.
Double Battles were first introduced in Generation III.
Double Battles were used almost exclusively in Pokémon XD: Gale of Darkness and Pokémon Collesseum. It will also be noted that they do appear in Soul Silver and Heart Gold but only breifly. Tag battles are more common and are hard to avoid, they appear in Emarald Green and Ruby Red and up to X and Y. Double battles may aslo occur in tournaments and online with other players by choice.