False Swipe

[SparkleSkarmory]

How's this team for story

For sketching a move, people usually bring the smeargle(holding a lagging tail is recommended) and the pokemon knowing the move and hunt for a double battle in friend safaris. In a double battle, use the move, then sketch it with smeargle. Lagging tail ensures smeargle moves after the other pokemon so sketch doesn’t fail. You can also go to a smeargle friend safari, lead with the pokemon knowing the move, use the move, opponent smeargle sketches it, switch in your smeargle, use sketch. This way…

The second technique (going to a smeargle friend safari) works very good for me. But for early game, you can go with a delta scyther, or as Johny0z said a normal scyther.