Cool Team redux

Celesteela @ Assault Vest
Ability: Beast Boost
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Air Slash
- Flamethrower
- Flash Cannon
- Giga Drain

Gigalith (M) @ Air Balloon
Ability: Sand Stream
Shiny: Yes
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature
- Earthquake
- Explosion
- Rock Blast
- Stealth Rock

Sableye-Mega (M) @ Sablenite
Ability: Prankster
EVs: 248 HP / 252 SpA / 8 SpD
Modest Nature
IVs: 0 Atk
- Dark Pulse
- Dazzling Gleam
- Nasty Plot
- Recover

Dhelmise @ Expert Belt
Ability: Steelworker
Happiness: 0
EVs: 248 HP / 252 Atk / 8 SpD
Adamant Nature
- Anchor Shot
- Earthquake
- Power Whip
- Shadow Claw

Tapu Fini @ Leftovers
Ability: Misty Surge
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
IVs: 0 Atk
- Defog
- Haze
- Hydro Pump
- Nature's Madness

Garchomp (M) @ Rocky Helmet
Ability: Rough Skin
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Dragon Tail
- Earthquake
- Rest
- Sleep Talk