Once again people are making bad judgments about Megas. LO Gengar has more damage, but is slower and frailer - but he can also switch in on ground moves, while Megagengar cannot. Kyurem W has incredible physical damage, but physical damage is easy to counter - it's called will-o-wisp. Kyurem W is also not 130 base speed. If it were, Kyurem W would be in Uber where it'd belong. I think.
The problem with speculating where pokemone are going to be tier'd... I mean, if we allow any of the megaforms to be in OU, it's going to beg an imporant question - which megas are then necessary to check the others? Banning megagengar potentially bans an deasy counter to megamedicham or megakhangaskhan (not that I'm claiming mgengar IS the best counter, but he could be, as the metagame evolves). If MegaAllakhazam's best counter is MegaGengar, and we ban him outright, we may get a skewed idea of how OU tier should be set up. It may be that all megaforms should be banned to uber play, or that perhaps, as a result of megas being 'balanced' for OU play, certain ubers should be allowed to come down from uber to check these megaforms. I don't know, really. But, MegaGengar is easy beaten if you can bring in someone like Dugtrio when he evolves, because without levitate, you've now arena trapped him and can EQ or sucker punch him to death.
I did want to bring up Mega Pinsir though, since I don't know if anyone has considered him seriously yet.
Firstly, we know from testing that pixelate/refridgerate boost the power of shifted moves. Pinsir gets Aerilate and 155 base attack, making his physical offensive power great. He becomes flying, so he's immune to ground, and since he megaevolves to be flying, he won't take x4 from Stealth Rocks. His defense and special defense are good, his speed kind of kills enthusiasm - only 105 - but I want to entertain what aerilate gives him?
Thrash - 120 power physical flying move with no recoil
Quick Attack - priority stab
Swords Dance
Swagger - Does this hit ghosts now?
Flail - Powered up by aerilate
Close Combat / Super Power
Earthquake
If aerilate gives as good a boost as technician does to Scizor, is it fair to say Pinsir has similar offensive power when using Flying moves like quick attack or Thrash? And with swords dance, he can fill the same role as Scizor. Pinsir is also naturally much speedier, not as speedy as we'd like, but he can outspeed those who might try to beat out mega scizor, and can outspeed megascizor himself, matching his swords dances. Pinsir also does neutral stab damage with Thrash or Quick Attack to scizor. Pinsir is less bulky and with poorer typing than Scizor, but he still feels like'll be compelling in OU, especially since he lacks a x4 weakness to fire (though his weakness to SR makes him unwieldy still I guess).
MManetric is also really exciting. 135 base speed and 135 base SpA? Kind of crazy - he's perfect for OU, especially with intimidate, an ability which will let him force switches and prevent easy counters that try to throw an EQ at him. Notable moves are:
Overheat / Flamethrower
Thunderbolt / Volt Switch (abuse that intimidate by switching frequently)
Ice Fang (Garchomp/Dragonite) / Crunch (Can we come up with a mixed Manetric that can OHKO Megagengar? It outspeeds it, so it's a pretty good counter to consider)
Quick Attack / Roar / Light Screen / Switcheroo
Manetric has amazingly good coverage with Ice Fang / Flamethrower / Voltswitch / Crunch, his attack stat isn't that great, but it's good enough to threaten x4 weaks or those with low defense like MZam and MGengar. It also has some good support moves, like Switcheroo (does this work with megastones?).
