Necrozma-Dusk-Mane @ Leftovers / Solganium Z  
Ability: Prism Armor  
EVs: 248 HP / 8 Def / 252 SpD  
Careful Nature  
- Stealth Rock  
- Spectral Thief  
- Sunsteel Strike  
- Morning Sun
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Optional Move(s)
- Toxic
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Necrozma-Dusk Mane @ Solganium Z / Weakness Policy  
Ability: Prism Armor
EVs: 248 Atk / 8 SpD / 252 Spe
Adamant Nature
- Swords Dance
- Sunsteel Strike
- Earthquake
- Rock Polish / Bullet Punch
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Necrozma-Dusk Mane @ Ultranecrozium Z
Ability: Prism Armor
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Photon Geyser
- Earthquake
- Stone Edge / Outrage / Sunsteel Strike
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Optional EV/IV(s):
- 52 HP / 204 Atk / 12 SpD / 240 Spe  Jolly Nature  
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Necrozma-Dusk Mane @ Ultranecrozium Z
Ability: Prism Armor
EVs: 52 HP / 204 SpA / 12 SpD / 240 Spe  
Timid Nature
- Calm Mind
- Photon Geyser
- Heat Wave
- Dragon Pulse / Power Gem
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Overview:
Necrozma-Dusk-Mane is a great pokemon with a good offensive presence thanks to access to Swords Dance, Rock Polish and a strong Z-Move. Its good defensive typing and Prism Armor grants it a great set-up opportunity and can also run a defensive set that can check Xerneas, Mega-Salamence and Tapu Lele. It also has an option to Ultra Burst, which grants it a great Speed tier, another strong Z-Move, and can run a special set. However, Necrozma-Dusk-Mane suffers from low Speed, which leaves it outsped by almost any pokemon. Its primary STAB move are average at best and can struggled against pokemon that can resist it such as Primal Groudon, Ho-oh and Celesteela. While it can mitigate with the used of Ultra Burst, it is more prone to being revenge killed afterwards due to losing its Steel-Typing and a portion of its bulk.