A couple of nitpicks:
Mega Pinsir has Aerilate Return/Frustration, not Brave Bird. Also, Banded Staraptor is the only one that doesn't need rocks to OHKO, the others need rocks to do it, and it's not even guaranteed:
252 Atk Aerilate Mega Pinsir Return vs. 252 HP / 252+ Def Gourgeist-Super...