Nothing creative whatsoever with the move set, but suggesting a different item + EV Spread for Volcarona.
Volcarona @ Coba Berry
Ability: Flame Body
Nature: Timid
EVs: 108 Def, 232 SAtk, 168 Spe
- Quiver Dance
- Fire Blast / Fiery Dance
- Bug Buzz
- Hidden Power Rock
Some Calcs vs Talonflame
• 252 Atk Choice Band Talonflame Brave Bird vs. 0 HP / 108 Def Coba Berry Volcarona: 262-310 (84.2 - 99.6%) -- guaranteed 2HKO
• 252 Atk Sky Plate Talonflame Brave Bird vs. 0 HP / 108 Def Coba Berry Volcarona: 211-249 (67.8 - 80%) -- guaranteed 2HKO
• 252 Atk Life Orb Talonflame Brave Bird vs. 0 HP / 108 Def Coba Berry Volcarona: 230-270 (73.9 - 86.8%) -- guaranteed 2HKO
• 252+ Atk Sky Plate Talonflame Brave Bird vs. 0 HP / 108 Def Coba Berry Volcarona: 231-273 (74.2 - 87.7%) -- guaranteed 2HKO
• 252+ Atk Life Orb Talonflame Brave Bird vs. 0 HP / 108 Def Coba Berry Volcarona: 251-296 (80.7 - 95.1%) -- guaranteed 2HKO
• 252+ Atk Choice Band Talonflame Brave Bird vs. 0 HP / 108 Def Coba Berry Volcarona: 288-340 (92.6 - 109.3%) -- 56.3% chance to OHKO
• 232 SpA Volcarona Hidden Power Rock vs. 48 HP / 0 SpD Talonflame: 360-428 (116.5 - 138.5%) -- guaranteed OHKO
Was found when I was breeding HP Rock Volcarona just for funsies, but I was surprised at how well this worked. Since HP Rock forces you to drop down your speed IV to 30, there wasn't much point in running max speed since other base 100s will always outrun you, so I dropped it down to 168 so with Timid you'd still be faster than Jolly Excadrill. I guess you could still try to outrun Timid Hydreigon and base 90s like Roserade, but those are pretty rare.
Because Talonflame is a pretty big thorn in attempting a Volcarona sweep, this set gives you a much better chance at accomplishing that. Adamant + Choice Band is Talonflame's most reliable way of beating this, but even then it's not a particularly great chance.
If your opponent has no other priority users, you can afford to Quiver Dance first as they switch to Talonflame, then go HP Rock (make sure the Talonflame isn't Adamant + Band though). Otherwise just HP Rock on the switch in just so you're not crippled enough to be finished off by Aegislash's Shadow Sneak or something. Also go with 4 HP / 104 Def on cartridge in case you weren't able to keep Rocks away (this won't work if you weren't).
It's pretty situational, I realize, but I always feel that some bulk on Volc is better than 252/252 SAtk/Spe, and it doesn't have too many better options for a fourth moves slot. Gastrodon isn't around so Giga Drain is less viable, while using HP Rock allows you to beat Volcarona's biggest counter (who is everywhere atm), Charizards, some random weakened Dragons, and other Volcaronas, and HP Ground is mainly just for Heatran.
I've been able to start some late game sweeps with this because I don't have to worry about Talonflame, but admittedly experience with it isn't too extensive, so someone please tell me this won't work at all (in the grand picture as opposed to my limited play time with it) so I don't have to bother breeding a Timid one in game (I have a Modest one by luck but I don't really want that). I probably still will, though, again, just for funsies. :)