Z Giga Impact gyarados build

Gotta Run Fast (Gyarados) @ Normalium Z
Ability: Moxie
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Giga Impact
- Dragon Dance
- Waterfall
- Earthquake

From the mud! (Dugtrio) @ Focus Sash
Ability: Arena Trap
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Stealth Rock
- Memento
- Reversal

Top Fins (Tapu Fini) @ Leftovers
Ability: Misty Surge
EVs: 248 HP / 184 Def / 76 Spe
Bold Nature
IVs: 0 Atk
- Defog
- Taunt
- Nature's Madness
- Moonblast

Pull Weed Off! (Tangrowth) @ Assault Vest
Ability: Regenerator
EVs: 248 HP / 248 SpD / 12 Spe
Sassy Nature
- Leaf Storm
- Knock Off
- Earthquake
- Hidden Power [Ice]

Hello? (Metagross-Mega) @ Metagrossite
Ability: Tough Claws
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Ice Punch
- Meteor Mash
- Earthquake
- Zen Headbutt

Papercut (Garchomp) @ Choice Scarf
Ability: Rough Skin
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
- Earthquake
- Rock Slide
- Outrage
- Fire Blast