Volcarona (M) @ Bug Gem
Trait: Flame Body
EVs: 4 HP / 4 Def / 248 SAtk / 252 Spd
Modest Nature (+SAtk, -Atk)
- Bug Buzz
- Heat Wave
- Protect
- Hidden Power [Ground]
Gyarados (M) @ Leftovers
Trait: Intimidate
EVs: 252 HP / 160 Def / 52 SDef / 44 Spd
Adamant Nature (+Atk, -SAtk)
- Thunder Wave
- Ice Fang
- Waterfall
- Taunt
A combo I used for a bit on the PO server, and its very effective. Bug Buzz from Volcarona can leave a dent in just about anything, and to ensure it gets a chance to hit, Gyarados can do multiple things. It can Paralyze faster threats such as Terrakion, Latios, Scarf Tyranitar, and the like. Taunt can prevent Trick Room or other status such as Thunder Waves and Will-O-Wisps. Hidden Power Ground is a nice surprise for Heatran, but you can use Quiver Dance in its place, or even HP Ice to catch Mence and Chomp off guard, but you'll need to use Icy Wind on Gyara or Timid on Volc.