In case anyone's wondering, Im using
Shandera (f) @ Balloon
Modest Nature, (80hp, 252SpA, 178speed)
~Fire Blast
~Shadow Ball / Energy Ball
~Nitro Charge
~Hidden Power Ice (although Ground and Fighting are extremly useful, too).
The evs seem a bit awkward, but work good. Max special attack is obvious. 178 speed allows me to outrun everything at 361 or less after a nitro charge (which is extremely easy to get). Dual stab is always nice, and the Hidden Power type depends on what you want to beat. Ground nails fires (especially Heatran), Fighting is there mainly for T-Tar (although it never ohkos), and ice hits dragons that are on literally every team.
Whatever you do, do not nitro charge early in the match, since it'll be easier to kill later on, implying your opponent has decent prediction skills. Instead, save it for late game. Bring in on an obvious Earthquake, thanks to balloon, nitro charge on the switch, and proceed to thrash stuff with a massive SpA, stab Fire Blast, and some rather decent coverage. For maximum overtroll, I team her up with volt change denchura on obvious fire moves.