Blastoise's Destructive Cannon V. 1.0

Blastoise-Mega (M) @ Blastoisinite
Ability: Rain Dish
EVs: 132 HP / 252 SpA / 124 Spe
Modest Nature
IVs: 0 Atk
- Scald
- Dark Pulse
- Aura Sphere
- Rapid Spin

Clefable (F) @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Aromatherapy
- Moonblast
- Soft-Boiled
- Wish

Landorus-Therian @ Leftovers
Ability: Intimidate
EVs: 248 HP / 240 Def / 20 Spe
Impish Nature
- Stealth Rock
- Earthquake
- Hidden Power [Ice]
- U-turn

Ferrothorn (M) @ Leftovers
Ability: Iron Barbs
EVs: 252 HP / 92 Def / 164 SpD
Sassy Nature
IVs: 0 Spe
- Spikes
- Power Whip
- Gyro Ball
- Leech Seed

Nihilego @ Choice Scarf
Ability: Beast Boost
EVs: 180 SpA / 80 SpD / 248 Spe
Timid Nature
IVs: 0 Atk
- Toxic Spikes
- Power Gem
- Sludge Wave
- Hidden Power [Fire]

Zygarde @ Leftovers
Ability: Aura Break
EVs: 188 HP / 140 Atk / 180 Spe
Adamant Nature
- Dragon Dance
- Thousand Arrows
- Extreme Speed
- Substitute