Mew @ Expert Belt

Trait: Synchronize
EVs: 128 Atk / 128 SAtk / 252 Spd
Naive Nature (+Spd, -SDef)
- Drain Punch
- Giga Drain
- Work Up
- Earthquake
Heatran (F) @ Leftovers

Trait: Flash Fire
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Fire Blast
- Earth Power
- Stealth Rock
- Hidden Power [Grass]
Chandelure (M) @ Choice Scarf

Trait: Shadow Tag
EVs: 4 HP / 252 SAtk / 252 Spd
Modest Nature (+SAtk, -Atk)
- Energy Ball
- Shadow Ball
- Fire Blast
- Hidden Power [Ground]
Flygon (M) @ Choice Band

Trait: Levitate
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Fire Punch
- Dragon Claw
- Earthquake
- U-turn
Gastrodon-Ea (Gastrodon-East) (M) @ Leftovers

Trait: Storm Drain
EVs: 252 HP / 4 SAtk / 252 SDef
Modest Nature (+SAtk, -Atk)
- Scald
- Recover
- Earth Power
- Ice Beam
Genesect @ Choice Scarf

Trait: Download
EVs: 4 Atk / 252 SAtk / 252 Spd
Hasty Nature (+Spd, -Def)
- U-turn
- Ice Beam
- Thunderbolt
- Flamethrower