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This is the set I run, I don't see the point of running bulky Volcarona anymore because CB talonshit OHKOs it no matter what. One thing this set does really well is it fucks over rotom. Thing is you need to keep rocks off the field to get a chance to set up and not die to hydro pump.
>Switch in on something that can't hurt you
>QD on the switch
>They bring in rotom, QD again
Specs rotom can't even OHKO at this point so next turn you'll outspeed an OHKO with giga drain.
252+ SpA Choice Specs Rotom-W Hydro Pump vs. +2 0 HP / 4 SpD Volcarona: 246-290 (79 - 93.2%) -- guaranteed 2HKO
Specially defensive rotom is also nearly a guaranteed OHKO.
+2 252 SpA Life Orb Volcarona Giga Drain vs. 252 HP / 252+ SpD Rotom-W: 302-356 (99.3 - 117.1%) -- 93.8% chance to OHKO
The only thing you need to worry about from rotom is trick but since no one ever seems to do it, I don't worry about it too much.
It's still hardwalled by heatran, and azumarill and talonshit will fuck you up, but it has worked fantastically for me.