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The user immediately uses the last move that the opponent used to target the user. It will fail if the target did not select a move in the turn prior to this one, or if the target switches out, or if the last move used by the target was Mirror Move. If used when the target is charging for a two-turn attack, then Mirror Move will copy the move used directly before that move.
Mirror Move will fail if used on any self-targeting moves or any of the following:
Mirror Move has little competitive use, as rarely is the move used by the opponent useful against said opponent. Furthermore, unlike Mimic, the move is only copied for that turn, giving the opponent too much control over the mirrored move.
Copycat is a similar move that copies the last successfully executed move used in the battle.
Me First is a similar move that copies the move that the target selects and uses the target's move at 1.5x power.
Mimic is a similar move that copies the move that the target last used and replaces Mimic with the copied move.