OU the team

Landorus-Therian @ Choice Scarf
Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Knock Off
- U-turn
- Stone Edge

Magearna @ Choice Scarf
Ability: Soul-Heart
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Fleur Cannon
- Aura Sphere
- Ice Beam
- Volt Switch

Toxapex @ Black Sludge
Ability: Regenerator
EVs: 248 HP / 8 Def / 252 SpD
Calm Nature
- Scald
- Haze
- Recover
- Toxic Spikes

Celesteela @ Leftovers
Ability: Beast Boost
EVs: 252 HP / 132 Def / 124 SpD
Relaxed Nature
- Leech Seed
- Protect
- Heavy Slam
- Flamethrower

Heatran @ Leftovers
Ability: Flash Fire
EVs: 248 HP / 220 SpD / 40 Spe
Calm Nature
IVs: 0 Atk
- Stealth Rock
- Lava Plume
- Toxic
- Protect

Greninja @ Choice Specs
Ability: Battle Bond
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Ice Beam
- Extrasensory
- Hydro Pump
- Dark Pulse