Pokémon Black Version and Pokémon White Version - Triple Battle
Triple Battles are battles with three Pokémon in battle on each side. When a Triple Battle starts, the first Pokémon on each side is placed on the left of that side, the second Pokémon on the center, and the third on the right.
In Triple Battles, many moves can only target adjacent Pokémon. (See "targeting".)
A Pokémon on the left or right of a side can take a new action, called "Shift", located within the Fight command. The Shift command moves the Pokémon to the center and moves the Pokémon at the center, if any, to the first Pokémon’s previous position. Shifting has a priority level of 0 for the purposes of determining turn order; a Pokémon shifts instead of taking its attack segment. Encore doesn’t prevent the use of the Shift command.
If all of a Pokémon’s moves can’t be chosen for use as commands are chosen, that Pokémon can’t choose the Shift command (because the list of moves is not displayed when the Fight command is chosen). However, a Pokémon can still shift even if all its moves can’t be chosen for use after commands are chosen in the same turn.
If the Pokémon that used to be in the center position during a shift chose a single target for that move, shifting doesn’t change that target. Therefore, when that Pokémon’s attack segment comes and the target can’t be reached from the Pokémon’s new position, that target will avoid that attack and effects that happen whenever an attack targets the target won’t happen. (In Triple Battles, a position is targeted, not a Pokémon.)
At the end of a turn (after switching in fainted Pokémon), if there is only one Pokémon in battle on each side and each of them is on its left or each is on its right (when not directly facing each other), both Pokémon shift to the center.