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Copies the last successfully executed move used in the battle, fails if no move has been used. It doesn't matter if it was the Copycat user's own move or the opponent's move. It will also allow the Pokemon to use a move that is disabled if called by Copycat. Fails if the opponent switched in on the turn before Copycat was used or if the opponent switches out on the turn Copycat is used. This move is affected by Prankster.
Copycat cannot call upon the following moves:
This move is a rarely seen in competitive battles, because in general it is too situational to work. Even though it would be cool to send some moves back to the original user, it would require very specific situations and almost flawless predictions to actually do any good. However, one can make a case for Prankster Riolu with Copycat, Roar, and a Focus Sash as a very annoying strategy: the user first sets up entry hazards, then sends out Riolu. The Riolu uses Roar, then after forcing the opponent out, uses Copycat to repeat Roar over and over, usually going first thanks to Prankster, slowly wearing down the opponent's team. Of course, even this strategy is easily stopped by priority attacks, Regenerator, or Protect.
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.
Mirror Move is a similar move that immediately uses the last move that the opponent used to target the user.