*reads DL's post like nine times*
Er, I don't like the cartoon physics thing. What's stopping a Smeargle user from constantly Sketching their opponent into ridiculously deep holes that can't be climbed out? Or painting them into cages? Or sealed tanks of water? Or dropping dump truck-sized anvils on them? Or painting walls that function like Protect but, since they're not Protect, could be feasibly used again and again in succession?
That on top of being able to Sketch any of their opponent's moves directly AND being able to draw any medium that can use any move = brrrroken. More broken than before this conversation?
Also, I think the Movelist entry for Sketch should be edited to include (among like fifty other things) a proviso about what makes for an acceptable medium. To use recent examples I've encountered, Ash trying to Sketch a rainbow-coloured orb that could call upon any move and battle gloves jewelled with all the elements.