Spdef (Heatran) @ Leftovers / Air Balloon
Ability: Flash Fire / Flame Body
EVs: 252 HP / 236 SpD / 20 Spe  
Calm Nature  
IVs: 0 Atk  
- Magma Storm  
- Earth Power  
- Taunt / Stealth Rock
- Stealth Rock / Toxic / Heavy Slam

Physdef (Heatran) @ Air Balloon / Leftovers
Ability: Flame Body  
EVs: 252 HP / 236 Def / 20 Spe  
Bold Nature  
IVs: 0 Atk  
- Magma Storm / Lava Plume
- Earth Power / Protect
- Toxic / Will-O-Wisp / Taunt / Rest
- Stealth Rock

Offensive (Heatran) @ Air Balloon / Choice Specs / Choice Scarf
Ability: Flash Fire / Flame Body
EVs: 4 Def / 252 SpA / 252 Spe  
Timid / Modest Nature  
IVs: 0 Atk  
- Magma Storm  
- Earth Power  
- Taunt / Fire Blast
- Eruption / Toxic / Stealth Rock