Forces target to use the move they last used for the next 3 turns. If the selected move allows its user to select a target, a target will be selected at random each turn. If the target is prevented from using the selected move by some other effect, Struggle will be used instead. The effect of Encore ends if the affected move runs out of PP.
If the target hasn't used a move since entering the field, if it tried to use a move this turn and failed, if it no longer knows the selected move, or if the selected move has 0 PP remaining, Encore fails. Encore also fails if the target's last used move was any of the following: Encore, Mimic, Mirror Move, Sketch, Struggle, or Transform.