Dhelmise @ Dhelmite  
Ability: Steelworker  
Level: 50  
EVs: 252 HP / 252 Atk / 4 SpD  
Adamant Nature  
IVs: 0 SpA  
- Poltergeist  
- Swords Dance  
- Anchor Shot  
- Protect

Unown
Move options:
- offensive: Heavy Slam, Liquidation, Superpower, Power Whip
- supportive: Ally Switch, Substitute, Flip Turn, Helping Hand

Unown
Offensive calcs:
- +2 252+ Atk Mega Dhelmise Poltergeist vs. 252 HP / 0 Def Mega Walrein: 252-297 (116.1 - 136.8%) -- guaranteed OHKO
- +2 252+ Atk Mega Dhelmise Poltergeist vs. 252 HP / 4 Def Mega Rillaboom: 211-249 (101.9 - 120.2%) -- guaranteed OHKO
- +1 252+ Atk Mega Dhelmise Poltergeist vs. 0 HP / 0 Def Urshifu-Rapid Strike: 172-204 (98.2 - 116.5%) -- 87.5% chance to OHKO
- 252+ Atk Mega Dhelmise Poltergeist vs. 252 HP / 0 Def Aegislash-Shield: 174-206 (104.1 - 123.3%) -- guaranteed OHKO
Defensive calcs:
- 252 SpA Mega Gengar Shadow Ball vs. 252 HP / 4 SpD Mega Dhelmise: 150-176 (84.7 - 99.4%) -- guaranteed 2HKO

Unown
Useful partners:
- Rain abusers: Dracovish, Kingdra, Urshifu-Rapid Strike, Ludicolo, Araquanid, Blastoise
- Electric or Grass Pokémon to threaten Water Pokémon: Zapdos, Thundurus-T, Regieleki, Rotom-W, Kartana, Rillaboom, Tapu Bulu

Dhelmise @ Dhelmite  
Ability: Steelworker  
Level: 50  
EVs: 252 HP / 20 Atk / 236 Def  
Adamant Nature  
IVs: 0 SpA  
- Poltergeist  
- Swords Dance 
- Anchor Shot  
- Protect

Unown
Move options:
- offensive: Heavy Slam, Liquidation, Superpower, Power Whip
- supportive: Ally Switch, Substitute, Flip Turn, Helping Hand

Unown
Offensive calcs:
- +2 20+ Atk Mega Dhelmise Poltergeist vs. 252 HP / 0 Def Mega Walrein: 216-255 (99.5 - 117.5%) -- 93.8% chance to OHKO
Defensive calcs:
- 252 Atk Urshifu-Single Strike Wicked Blow vs. 252 HP / 236 Def Mega Dhelmise on a critical hit: 152-180 (85.8 - 101.6%) -- 6.3% chance to OHKO
- 252+ Atk Mystic Water Urshifu-Rapid Strike Surging Strikes (3 hits) vs. 252 HP / 236 Def Mega Dhelmise in Heavy Rain on a critical hit: 153-180 (86.4 - 101.6%) -- approx. 6.3% chance to OHKO
- 252 SpA Mega Gengar Shadow Ball vs. 252 HP / 0 SpD Mega Dhelmise: 150-176 (84.7 - 99.4%) -- guaranteed 2HKO

Unown
Useful partners:
- Rain abusers: Dracovish, Kingdra, Urshifu-Rapid Strike, Ludicolo, Araquanid, Blastoise
- Electric or Grass Pokémon to threaten Water Pokémon: Zapdos, Thundurus-T, Regieleki, Rotom-W, Kartana, Rillaboom, Tapu Bulu