Volcanion @ Power Herb
Ability: Water Absorb
EVs: 248 HP / 8 Def / 252 SpA
IVs: 0 Atk
- Solar Beam
- Fire Blast
- Steam Eruption
- Sludge Wave / Focus Blast / Earth Power
Power Herb Volcanion actually works a decent lure for bulky waters, allowing it to kill with Solar Beam. This can be pretty useful if you find your team weak to such threats. The rest are pretty self explanatory. Fire Blast and Steam Eruption are Dual Stabs, while the last two slots are dedicated to coverage moves of your choice. The EVs are so that Volcanion does not take exactly 25% from SR damage and maximizes its Sp. Atk.
You could also run 4 Def / 252 Sp. Atk / 252 Speed , but Volcanion's speed is rather pitiful. Another possibility would be to run Rash Nature with Superpower to get Chansey switch-ins, but it still only does around 30 - 40 % without any Attack investment.
Specs Volcanion is also a great set because it becomes a great wall-breaker.
Air Balloon Volcanion is also another possibility, as it offers a switch-in to Ground types and possibly KO them with Steam Eruption.