Maaan I wish there was a Doubles version of this. It would be amazing. Hyper Voice alone would radically alter Doubles play. And being able to have Hitmontop remove 50% of Mega Kangaskhan's health in one Fake Out would be amazing. Speaking of Hitmontop...
Hitmontop
Having access to Technician, Fake Out and Feint, Hitmontop can be startlingly dangerous threat if you have inadequate Fighting resistance. Since it also has access to Bullet Punch, it can even do a number on Fairies, and it get Sucker Punch too so not even Ghosts are safe. I'm actually running a Hitmontop with all four of these moves, and while it's very narrowly focused in its effectiveness it is really, really hard to respond to if you lack significant Fighting resistance or it's just Fairies. I'd be more concerned by the potential for it to be obnoxious, but it has difficult touching Ghosts that decide to dump Will O Wisp on it and is, in any event, made a joke by Dragonite and to a lesser extent Noivern. I suspect the Fake Out/Feint/Bullet Punch/Sucker Punch build will stop being at all useful once people stop expecting Terrakion to survive the Fake Out, but for the moment I've done some nasty stuff with it.
I'm actually running a silly Fake Out abuse team, and once I realized it needed hazards to actually punish switches, it's become a weirdly solid team. I can probably improve upon it, but it's really interesting.
... and probably really obnoxious to fight.