Tapu Koko @ Assault Vest  
Ability: Electric Surge  
Level: 50  
EVs: 252 HP / 132 SpD / 124 Spe  
Timid Nature  
- Electroweb  
- Volt Switch  
- Nature's Madness  
- Sky Drop

Unown
Move option:
- supportive: U-Turn

Unown
Defensive calcs:
- 252+ Atk Glastrier High Horsepower vs. 252 HP / 0 Def Tapu Koko: 146-174 (82.4 - 98.3%) -- guaranteed 2HKO
- 252 SpA Mega Gengar Sludge Bomb vs. 252 HP / 132 SpD Assault Vest Tapu Koko: 134-162 (75.7 - 91.5%) -- guaranteed 2HKO
- 252+ SpA Kingdra Hydro Vortex (185 BP) vs. 252 HP / 132 SpD Assault Vest Tapu Koko in Rain: 153-180 (86.4 - 101.6%) -- 12.5% chance to OHKO

Unown
Useful partners:
- Electric Terrain abuser: Mega Vikavolt, Xurkitree, Regieleki
- others: Mega Cacturne