Encore prevents the target from using any move except the last move that it used for 2 to 6 turns. If the Pokémon affected by Encore runs out of PP for the affected move, the effects of Encore end immediately.

What is the point of Encore Pokémon?

Encore is a non-damaging Normal-type move introduced in Generation II. It forces the foe use the same move for 2-5 turns. However, if Disable is used after Encore, the target will be forced to use Struggle until Encore and Disable's effects wear off.

Can you switch out of encore?

Encore is cancelled out when they switch but they can't switch whith shadow tag so wobby is deadly. Safeguard to block status. Basically you sub to block status and encore the move. You then pass the substitute to another pokemon.