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Voting Do Not Ban on Gengarite.
I base this on 208 uberssuspect ladder games without having used MGengar at all. The most dangerous MGengars I faced were those that didn't make much use of its annoying traits (perish song, destiny bond, taunt, etc), but rather those that simply use its great...
Confirming as Shaquillinite:
http://i.imgur.com/hdvIrbZ.jpg
I haven't had major issues with Gengar, but ultimately it basically functions as "you must significantly outplay your opponent to succeed against it." Competition is about "may the best player win," but Mega Gengar upends that...
I am interested in the following:
Ferroseed
Iron Barbs
Relaxed/Sassy 31/31/31/X/31/0
Egg Moves: Leech Seed, Spikes, Stealth Rock
I can offer any Pokemon Y exclusive Megastone or some Leftovers.
I am interested in Togepi, Drilbur, and Ferroseed. I can readily offer Battle Maison items of your choosing. Working on Leftovers, but that is slow going and I can not promise any results.