At a glance: Volcarona

Volcarona

This Pokemon is a bundle of surprises, and if you didn't think the same when you read the above, let me show you what I mean.

• Access to Butterfly Dance
  This might be the greatest boosting move that exists in the game. With extraordinarily few Pokemon getting it and most of them sucking, that Volcarona gets it is a godsend. It gives Volcarona +1 SpA / +1 SpD / +1 Spe and almost single-handedly enables his sweep off the bat. Couple that boosting move with base 135 Special Attack and base 100 Speed and you've got a ferocious sweeper on your hands. Don't give it the chance to get +2 or you're pretty much screwed.
• Amazing stat distribution and typing for a speedy special sweeper
  I mentioned it above and I'll say it again here: Volcarona
• has an ideal distribution of stats for what it is attempting. 85/60/105 are legitimate defenses for a sweeper like this, all coupled with a resistance to both Bullet Punch and Mach Punch make for a great build. Add to this the fact that even bulky Water-type Pokemon won't want to switch in because Volcarona is boosting its great Special Defense and can puncture them with its immensely powerful attacks and avoid being KOed in return and you'll see just how deadlyVolcarona is.
• Perhaps the best sun sweeper that exists
  It may not have Chlorophyll, but this thing uses the sun like a fiend with Wind Storm, STAB Fire Blast, Solar Beam, and Butterfly Dance to boost its already impressive stats. If you are running a sun team, use this Pokemon. Trust me.
• 4x Stealth Rock weakness
  It's not all sunshine for Volcarona, though. That typing is perhaps its single greatest fault. Being 4x weak to Stealth Rock forces you to run Rapid Spin support or sacrifice Volcarona's respectable bulk when attempting your sweep.