49+ Sketch Smeargle Background. Sketch allows the user to learn the target's last move permanently, replacing sketch in the process. It is smeargle's signature move.
This means you must use other methods to get moves on smeargle. But what sketch does is permanently copy a foe's move. It enables the user to learn a move used by the foe.
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If smeargle uses sketch, then it will learn surf permanently. It is smeargle's signature move. Then when it does you can freely sketch. Smeargle can learn the move every ten levels or by going to a move tutor.