ScarfTran (Heatran) @ Choice Scarf  
Ability: Flash Fire  
Level: 50  
EVs: 4 HP / 4 Def / 252 SpA / 12 SpD / 236 Spe  
Timid Nature  
IVs: 0 Atk  
- Earth Power  
- Overheat  
- Flash Cannon  
- Flamethrower  
139 to outspeed mega lopunny and speedcreep 138 speed mons by 1 point. Flamethrower can be fire blast. Spdef for p2 download boost.

Spdef Tran (Heatran) @ Leftovers  
Ability: Flash Fire  
Level: 50  
EVs: 212 HP / 252 SpD / 44 Spe  
Calm Nature  
IVs: 0 Atk  
- Lava Plume  
- Protect  
- Roar/Toxic/Stealth Rock
- Earth Power/taunt
Max spdef, the speed is to outspeed base 50s, mainly adamant mega mawile, 212 hp for leftovers number, last 2 moves can be any of 4, can also wiki berry

Anti-Mimi Wiki (Heatran) @ Wiki Berry  
Ability: Flash Fire  
Level: 50  
EVs: 220 HP / 172 Def / 92 SpA / 4 SpD / 20 Spe  
Modest Nature  
- Rock Tomb  
- Flamethrower  
- Flash Cannon  
- Toxic  
Lives +2 ghostium-z from mimikyu and flash cannon ohkos non-bulky mimikyu, speed allows to outspeed mimikyu at -1, last move tossup

Asamipoke Air Balloon Tran (Heatran) @ Air Balloon  
Ability: Flash Fire  
Level: 50  
EVs: 244 HP / 36 SpA / 4 SpD / 220 Spe  
Modest Nature  
IVs: 0 Atk  
- Magma Storm  
- Earth Power  
- Hidden Power [Ice]  
- Taunt  
Asamipokes fast air balloon tran spread, 244 hp allows living mega metagross's hammer arm other than 1 number, 220 speed outspeeds celesteela. 

Grassium-Z Tran (Heatran) @ Grassium Z  
Ability: Flash Fire  
Level: 50  
EVs: 4 HP / 4 Def / 252 SpA / 12 SpD / 236 Spe  
Modest Nature  
IVs: 0 Atk  
- Flash Cannon  
- Flamethrower  
- Earth Power  
- Solar Beam  
Similar spread to scarf tran with download boost, grassium-z baits in typical counters