I've been thinking. Since Smeargle will eventually appear in PTD2, then how would his signature move, Sketch, work? The opponent Pokemon hardly attack at all and if they do, it would be extremely unpredictable. Since Sketch copies that move forever, then would Smeargle really be all that useful?
Or it could be broken and ridiculously cheap when it copies powerful legendary-exclusive moves. It could be able to use Mewthree's disappear move thingy. That would be broken.