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So it is! I use Pokemon Online for competitive battling and have seen that strategy used before. I'm guessing it was exploiting an un-updated version of the simulator. That explains why all the Whimsicott cheese disappeared....
I stand by Whimsicott being the better of the two though as prankster substitutes, stun spore and encore can make for an annoying battle on your opponent's side. And considering NPCs don't switch all too often being able to trap an opponent on a non-damage dealing move with Encore can set up an easy win.