Pokémon Black Version and Pokémon White Version - Double Battle
A Double Battle is a battle with two Pokémon in battle on each side. When a Double Battle starts, the first Pokémon on each side takes the left position, and the second Pokémon on each side takes the right position. If there are two Trainers on a single side, instead the first Pokémon on the left Trainer’s party takes the left position of that side, and the first Pokémon on the right Trainer’s party takes the right position of that side.
In Double Battles with wild Pokémon, effects of moves and held items can’t cause the battle to end. (Red Card won’t trigger.) However, the player can still end such battles using a Poké Toy, Fluffy Tail, Pok Doll, or the Run command.