I hate to transfer Terrakion, since he will only have one chance to learn Stealth Rock, and it likely won't stay for this competition. Then again, it's likely the tutors will be back in several months for Ultra Moon. He, Whimiscott, and Weavile are looking good for this competition. Now to figure out what the other 3 should be.
It's a shame that Oricorio doesn't have the same amount of Attack. Imagine a Tyranitar Dancer set.
Maybe I'll combine the Dancer set with Terra-cotta. Add Tyranitar, because I love him, and have an Unnerver. I'll probably be able to teach him Stealth Rock and the punching moves again in Ultra Moon. It's not like they share the all the same weaknesses, and it would make it harder to stop me from setting up, but it would result in mind games, which I'm NOT good at, especially in a short amount of time.
Edit: I cannot believe I randomly hatched a Timid Oricorio. I'm going to try to see if I can luck out on minimal attack to reduce the effect of non-STAB Sucker Punches.