I would suggest Volcarona as a fast special sweeper for this team as its mates would cover its weaknesses well. I would use:
Volcarona @Life Orb / Sitrus Berry
252 SpAtt / 252 Spe / 4 HP
-Flamethrower / Fire Blast / Fiery Dance
-Giga Drain / Roost
I would forgo defensive investment in place of readily available offensive prowess, using the spread shown. The fore move is up to personal opinion, with accuracy vs. power vs. secondary effects. Roost could be used to heal off damage from time Dancing or just to allow a continued sweep but as this is in-game, Giga Drain is probably better as you can heal and deal super-effective hits against water and rock types, which is quality. One thing to note is that you can really do much to other fore types. If they are Specially based you can stay in, tanking hits and boosting yourself to hopefully take it out +6 but against a physical fire type you can't do anything but get KO'd (if you don't switch obviously :P).
im not sure about anything