A Triple Battle is a type of Pokémon Battle introduced in Pokémon Black Version and Pokémon White Version, though they were mentioned in the anime during the Battle Frontier arc. Similar to Double Battles, trainers use three Pokémon at a time.
In Triple Battles, the Pokémon on the very right cannot attack the Pokémon on the very left and vice versa, but moves that are long range like Dragon Pulse and special moves like Acrobatics evade this rule. Pokémon can also be repositioned on the battle field by pressing the arrow button on the battle menu, but doing this costs the switched Pokémon's turn.
Anime[]
Triple Battles were mentioned in the Pokémon the Series when Ash traveled through Kanto to battle various Frontier Brains. When Ash fought Arena Tycoon Greta, her battle rules involved spinning a wheel to decide if the battle would be Single, Double, or a Triple Battle, but Ash got a Double Battle.