Double Meteor Beam Waters gen8nu

Omastar @ Power Herb
Ability: Weak Armor
Gender: M
Timid Nature
EVs: 4 Def / 252 SpA / 252 Spe
- Ice Beam
- Meteor Beam
- Shell Smash
- Surf

Aurorus @ Focus Sash
Ability: Snow Warning
Gender: M
Timid Nature
EVs: 252 SpA / 4 SpD / 252 Spe
IVs: 0 Atk
- Aurora Veil
- Blizzard
- Earth Power
- Stealth Rock

Decidueye @ Spell Tag
Ability: Long Reach
Gender: M
Adamant Nature
EVs: 252 Atk / 4 Def / 252 Spe
- Leaf Blade
- Shadow Sneak
- Spirit Shackle
- Swords Dance

Grimmsnarl @ Eject Button
Ability: Prankster
Bold Nature
EVs: 252 HP / 204 Def / 52 Spe
- Light Screen
- Reflect
- Spirit Break
- Taunt

Silvally-Ground @ Ground Memory
Ability: RKS System
Jolly Nature
EVs: 252 Atk / 4 SpD / 252 Spe
- Flame Charge
- Multi-Attack
- Rock Slide
- Swords Dance

Starmie @ Power Herb
Ability: Analytic
Modest Nature
EVs: 252 SpA / 4 SpD / 252 Spe
- Hydro Pump
- Meteor Beam
- Psyshock
- Rapid Spin