As I mentioned in chat, I don't like the direction you are taking with gen 7 movesets (general focus on 'diversity' over practical, THAT Gothitelle, etc.). It doesn't seem like that will change, so instead of getting into heated arguments, I will just stop playing the format.
But this still bugs me (pun not intended), so I'm going to elaborate with numbers why I think {CC, EQ, Quick Attack} is bad before dropping the topic.
- Fighting+Ground is much worse than Flying+Fighting or Flying+Ground as an attack type combination. Fighting+Ground gets walled by almost any mons with Flying type or Levitate. On the other hand, Flying+Fighting (e.g. Hawlucha) and Flying+Ground (e.g. dmax/Z Landorus-T) are infamously good combinations.
- Quick Attack is not good enough vs many bulky grass/fighting/bug mons Mega Pinsir is supposed to counter. To give some examples:
- Aerilate Return is obscenely strong against neutral targets and the main reason why Mega Pinsir is a threatening wallbreaker. Against slower teams or with Sticky Web, Mega Pinsir can often sweep after SD. To give random examples:
Of course, there could be games where having the coverage attacks and Quick Attack is ideal, but those games are probably a small fraction of games where you would want Mega Pinsir with Aerilate Return. In random battles where you are not building movesets for specific threats, giving mons a moveset that is strictly worse in majority of games seems like a poor decision.