Nihilego @ Power Herb  
Ability: Beast Boost  
Level: 50  
EVs: 4 HP / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Meteor Beam  
- Protect  
- Sludge Bomb  
- Power Gem

Unown
Options:
- offensive: Thunderbolt, Hidden Power Ice
- supportive: Trick Room
- items: Life Orb, Focus Sash, Rockium Z

Unown
Offensive calcs:
- +1 252 SpA Nihilego Meteor Beam vs. 236 HP / 236+ SpD Incineroar: 236-278 (118 - 139%) -- guaranteed OHKO
- +1 252 SpA Nihilego Meteor Beam vs. 4 HP / 0 SpD Landorus-T: 181-214 (109.6 - 129.6%) -- guaranteed OHKO
- +1 252 SpA Nihilego Sludge Bomb vs. 252 HP / 4 SpD Assault Vest Rillaboom: 204-240 (98.5 - 115.9%) -- 81.3% chance to OHKO

Unown
Useful partners:
- Grass Pokémon: (Mega) Rillaboom, Tsareena, Kartana
- Dark Pokémon: Urshifu-Single Strike, Galarian Moltres, Incineroar