Flash Clash

Greninja @ Choice Specs
Ability: Protean
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
- Ice Beam
- Hydro Cannon
- Dark Pulse
- Grass Knot

Porygon-Z @ Choice Scarf
Ability: Adaptability
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Hyper Beam
- Trick
- Dark Pulse
- Ice Beam

Chansey @ Eviolite
Ability: Serene Grace
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature
- Soft-Boiled
- Thunder Wave
- Seismic Toss
- Charm

Garchomp @ Choice Band
Ability: Rough Skin
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Outrage
- Earthquake
- Poison Jab
- Fire Fang

Aegislash @ Weakness Policy
Ability: Stance Change
EVs: 252 HP / 200 Def / 56 SpD
Sassy Nature
- Shadow Sneak
- King's Shield
- Shadow Ball
- Flash Cannon

Sawk @ Custap Berry
Ability: Sturdy
EVs: 8 HP / 252 Atk / 248 Spe
Adamant Nature
- Close Combat
- Poison Jab
- Thunder Punch
- Counter