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Bruh, it can't switch in on a fire punch...or just run a zone and be done with it.
84 Atk Technician Mega Scizor Bullet Punch vs. 0 HP / 0- Def Hoopa: 168-198 (55.8 - 65.7%) -- guaranteed 2HKO
252 Atk Life Orb Hoopa Fire Punch vs. 248 HP / 0+ Def Mega Scizor: 343-406 (100 - 118.3%) -- guaranteed OHKO
TBH the opportunity cost is too high for me to use it for the role it fulfills, like, its good for innovation rn, but when you have the monster, its like Greninja all over again.