If you are in a 2v2 battle you can go in with smeargle and something that knows BP. Only those 2 and it should fail and you can sketch it. Otherwise you need to put the BP'er to sleep and then sketch while it is sleeping.This stumped me when I got my first wishbliss. On my Serene Grace one I run wish/CM/Bolt/Beam, on my natural cure one I run wish/protect/toxic/ice beam
More importantly: how the hell do you sketch Baton Pass onto Smeargle? Need it for my new Absols...