Is there any merit to Tyranitar's Trick or Treat? It seems like the sort of thing you'd throw out as a failsafe when your opponent switches to a counter. Suddenly, Crunch is only resisted by Scraggy, Scrafty, and Pangoro, which could easily be handled by something else on your team. It also means that the S-mon that just switched in to set up something stupid is going to get revenged by Sucker Punch... unless it's Scrafty, I guess. Tyranitar also has Pursuit, so Trick-or-Treat lets it basically Pursuit trap everything.
Then again, this is a game of stupidly strong everything. If Tyranitar had Sucker Punch, Trick-or-Treat would be perfect, but...