Hell yeah it is, and if people are complaining about the Speed, give it revenge (I'm not even kidding, in OU 105 is outsped pretty easy)
+2 close combat can ohko mega Mawile, guaranteed with spikes. You don't always lose.
Could I see those calcs?
Earthquake is better against Mega Mawile because it is neutral to fight.
Obviously EQ > CC against Mawile. You don't need calcs to show me that a super effective move hits harder than a neutral move.
+2 252+ Atk (custom) Close Combat vs. 252 HP / 0 Def Mawile: 540-636 (177.63 - 209.21%) -- guaranteed OHKO
Jolly, by far. If you don't go Jolly then anything around the 100 base speed tier will outspeed you if they choose a positive speed nature. Mega-Pinsir really doesn't like taking hits it doesn't need to. You could potentially baton pass a speed boost from something, or use Sticky Web, but there are so many better pokes for doing that with, and several Mega-Evos. Pinsir may not have outstanding speed, but he has just enough to make it worthwhile investing.
All three are rather situational. If you want to be ballsy, you can use mold breaker, lure Rotom-W/H into Pinsir and hit them with Earthquake for enough damage to the point they can no longer check Mega Pinsir.
That's an impressive damage output. Does your Pinsir run an Adamant or Jolly Nature?
I've seen Toxic be really common on Gliscor, which isn't fun for Pinsir, but Substitute can stop it cold. Running Substitute means Pinsir can't get a Swords Dance, but I've found it still makes Gliscor a great opportunity for Pinsir to do all the setup it needs to nab at least one kill, most of the time.
Skarmory is a full stop to Pinsir, and bulky Rotom as well as Zapdos can take even a boosted hit and zap it in return. It's fast, but there are plenty of ways to outspeed it and take it out without priority while still making it past Quick Attack. Pinsir is great, but it requires support and is by no means unstoppable. If not for the Mega slot restrictions, I'd say it'd be OU for sure, but as it stands, I'm not certain. We'll have to see how Mega status impacts usage; all we can do is guess right now. But to be sure, it's an excellent Pokemon and a very worthwhile use of a Mega slot.
It exchanges Return, one of it's best STAB moves, for Substitute, so it won't be breaking much walls anytime soon, and will hardly be able to sweep.
What are things that can wall it?
CC is not a good option over EQ, especially on a sweeping set where you'll notice the Def drops. +2 QA is good, but it won't sweep teams on its own; you need Return. If you want to run Sub, just drop SD and go Substitute / Return / Earthquake / Quick Attack; it's awesome.
Anything with decent defenses not weak to Flying or Fighting will take a hit and smash right through that Pinsir, especially if it's weakened itself already by using CC.
Hmm, you think Return > SD? I have run that set on Showdown and its great, I come in say a Ferro, and Sub, it cant do jack to me, I sub, SD, and then proceed to destroy things. Usually stuff gets OHKO with a +2 Quick Attack. Return is def great, but T-Tar even at +2 survives an EQ, thats why I decided to run CC. Stuff like Gliscor cant do anything to me too, and I can just SD till I can take it out with Quick Attack.
It depends on the set. Ferrothorn and Gliscor sometimes have no way to get past Pinsir's Subs if they don't have the right attacking moves, but in that case, they'll just flee, and if they run stuff like Gyro Ball or Ice Fang, Pinsir shouldn't stay in to mess with them. Usually I find myself better off just slinging out Returns once I get a Sub up; if Pinsir forces a switch while behind a Sub, it can often get a kill before the opponent can break the Sub and force it out, one way or another.
It has additional attacks it can make us of, but Storm throw and X-Scissor really aren't among them...
