Original Speed Boost Nihilego

Nihilego @ Life Orb
Ability: Beast Boost
Level: 50
EVs: 36 HP / 44 Def / 172 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Power Gem
- Sludge Bomb
- Hidden Power [Ice]
- Protect

Celesteela @ Leftovers
Ability: Beast Boost
Level: 50
EVs: 188 HP / 4 Atk / 60 Def / 180 SpD / 76 Spe
Careful Nature
- Heavy Slam
- Flamethrower
- Leech Seed
- Protect

Tapu Koko @ Choice Specs
Ability: Electric Surge
Level: 50
EVs: 236 HP / 4 Def / 84 SpA / 76 SpD / 108 Spe
Timid Nature
IVs: 0 Atk
- Volt Switch
- Thunderbolt
- Dazzling Gleam
- Discharge

Gyarados @ Flyinium Z
Ability: Intimidate
Level: 50
Shiny: Yes
EVs: 52 HP / 196 Atk / 76 Def / 4 SpD / 180 Spe
Jolly Nature
- Protect
- Bounce
- Waterfall
- Dragon Dance

Garchomp @ Groundium Z
Ability: Rough Skin
Level: 50
EVs: 28 HP / 164 Atk / 4 Def / 92 SpD / 220 Spe
Adamant Nature
- Earthquake
- Fire Fang
- Dragon Tail
- Protect

Hariyama @ Assault Vest
Ability: Thick Fat
Level: 50
EVs: 28 HP / 180 Atk / 132 Def / 156 SpD / 12 Spe
Adamant Nature
- Fake Out
- Close Combat
- Knock Off
- Feint