Help Best Moveset for Volcanion?

[Card Slinger J]

I decided to go with Naughty Nature to help increase it's Attack since it has very low base stats in Special Defense mainly to help get around it's defensive check to Chansey/Blissey with Superpower while Earth Power is still an option over Sludge Bomb/Sludge Wave for dealing with Thundurus, Mega Manectric, and Raikou.

Volcanion @ Life Orb / Power Herb
Naughty Nature
156 ATK, 252 Sp. ATK, 100 Speed

• Steam Eruption
  
• Fire Blast
  
• Sludge Wave / Solar Beam / Earth Power
  
• Superpower

This is the best moveset I could come up with without resorting to Hidden Power Grass for getting around Gastrodon and Seismitoad unless I decide to run Power Herb for Solar Beam. Fire Blast is too good for dealing with Grass Types so it was hard for me to swap out from this moveset.