I'd be more worried about Psyshock from Gardeovoir, but even so, to only be 4HKOed by Pixilate Hyper Voice from Mega Gardevoir is pretty damn impressive. Mind you that's without a resistance... That's kinda ridiculous the more I think about it haha.
Anyway, someone mentioned Machamp on the last page, but it's actually fairly intriguing. Knock Off is a huge buff for it and actually lets it beat down the Ghost-types that were previously full-on stops for it. Unlike the other premier Fighting-types, Medicham and Heracross, it doesn't use up your Mega slot. Anyways, here's a set I've been testing out. Haven't done a lot of battles with it yet, but it's seemed pretty decent:
Machamp (F) @ Leftovers / Lum Berry
Trait: No Guard
EVs: 248 HP / 252 Atk / 8 SDef
Adamant Nature (+Atk, -SAtk)
- Dynamic Punch
- Knock Off
- Poison Jab
- Substitute / Bullet Punch
So, yeah, this thing can tear holes into stuff. Well, that's nothing new. Machamp has always been pretty good with that. However, there are a couple of buffs that really help it. Knock Off is the main one. No longer can you just fling in a Ghost-type and be safe from any attack, most notably, STAB Dynamic Punch. Thanks to No Guard, Dynamic Punch will always hit and will cause the opponent to only have a 50/50 shot of actually being able to attempt an attack on Machamp. Knock Off deals with Ghost- and Psychic-types that may try to test their luck. Great since it can hit Jellicent, Latias, and Celebi really hard. Poison Jab seems odd, but it's pretty much necessary considering Fairy-types take jack shit from your other two moves. Substitute is a great last move since Machamp can cause many switches due to the fear of its powerful Dynamic Punch. Bullet Punch is another option to keep Machamp from taking unecessary hits and finishing off weakened Fairy-types that may otherwise outspeed and smack Machamp. Leftovers should be used with Substitute so your health doesn't just vanish. If you don't use Leftovers, you can opt for a Lum Berry. Since Lum Berry gives Machamp a free pass on status, there's less of a need for Substitute with it and Bullet Punch should be used. Machamp can be a great wallbreaker for most sweepers that struggle to handle Fairy- or Ghost-type Pokemon. Haxorus, Mega Medicham, and Mega Heracross are just a few examples of such Pokemon.