Copycat: The Pokemon thinks about the last attack and repeats it exactly, duplicating the attack, but letting you choose a new target for the move. This move will fail if Copycat is the first move used in the battle, the last used move was Copycat, or the attack requires more energy than the user has. Charge-up actions and priority are ignored for a move copied by Copycat; all of its effects execute immediately when Copycat is used. (eg. If Copycat copies Revenge, it executes immediately. Likewise, if it copies Sky Attack, both the charge and the damage happen at once, and thus the move cannot be stopped by multi-hit attacks)
Attack Power: -- | Accuracy: -- | Energy Cost: 2 + Copied Attack | Attack Type: Other | Effect Chance: -- | Contact: No | Typing: Normal | Priority: 0 | CT: None
IIRC this means last attack every used by anyone.