Why do people feel the need to use Quiver Dance on it? Because the boosts are nice? Masquerain can't set up with it, and baton passing it is better on Venomoth. If anything, having Quiver Dance on Masquerain is just teasing it for not being able to use it well. How many of you wanna risk a OHKO for setup? I surely don't.
HYDRO PUMP (85 Accuracy is only 5 less than Hi Jump Kick; big deal. If I'm gonna try to down a Fire or Rock-type with this guy, I'll make the hit count)
ICE BEAM (Another great utility on Masquerain; murder those Dragons alongside Ground and Flying-types!)
BUG BUZZ (STAB; hits hard and decimates Grass, Psychic, and Dark-types)
HIDDEN POWER (GROUND) (Great for all-around coverage, but mostly for Steel and Electric tpyes. All weaknesses covered!)
Give him Life Orb or Choice Specs, and go to town. You have to be merciless with Masquerain, because it doesn't have time to screw around or hold back.