Unfortunately the only good set I could think of have already been taken (Bulky Support is Fuego). Therefore, my only contribution is this bad set.
Sun-Moth Solar Beam
Volcarona @ Heavy-Duty Boots
Ability: Flame Body
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Bug Buzz
- Fire Blast
- Solar Beam
- Psychic
Designed to go on Sun and waste no time wasting folks. Bug / Fire / Grass is only really resisted by other fire types, all of which take a massive chunk from Fire Blast in the Sun anyway. You could theoretically give up on Bug Buzz or Psychic for Quiver Dance, but losing coverage for Solar Beam just isn't worth it, especially with all the Toxapex running around. Timid has been chosen because of how good base 100 speed is in the tier, though Modest does hit like a truck. Psychic allows you to chunk Pex.
This set is not very good, but potentially could be better with some tweaking. Try it out and see what you think.