SUMO hazard stack

Skarmory @ Leftovers
Ability: Sturdy
EVs: 244 HP / 252 Def / 12 Spe
Impish Nature
- Spikes
- Whirlwind
- Brave Bird
- Roost

Scizor-Mega @ Scizorite
Ability: Technician
EVs: 248 HP / 44 Atk / 16 Def / 200 SpD
Impish Nature
- Roost
- Swords Dance
- U-turn
- Bullet Punch

Tapu Lele @ Choice Scarf
Ability: Psychic Surge
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Moonblast
- Psychic
- Hidden Power [Fire]
- Thunderbolt

Toxapex @ Rocky Helmet
Ability: Regenerator
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature
IVs: 0 Atk
- Recover
- Toxic Spikes
- Haze
- Scald

Heatran @ Grassium Z
Ability: Flash Fire
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Stealth Rock
- Earth Power
- Solar Beam
- Magma Storm

Tangrowth @ Assault Vest
Ability: Regenerator
EVs: 248 HP / 8 Atk / 252 SpD
Sassy Nature
- Earthquake
- Hidden Power [Fire]
- Giga Drain
- Knock Off