Excadrill @ Focus Sash  
Ability: Mold Breaker  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Earthquake  
- Rock Tomb  
- Rapid Spin  
- Stealth Rock

Necrozma @ Weakness Policy  
Ability: Prism Armor  
EVs: 252 Atk / 4 SpA / 252 Spe  
Naughty Nature  
- Dragon Dance  
- Photon Geyser  
- X-Scissor  
- Heat Wave

Kommo-o @ Throat Spray  
Ability: Bulletproof  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Clangorous Soul  
- Boomburst  
- Clanging Scales  
- Flamethrower

Azumarill @ Sitrus Berry  
Ability: Huge Power  
EVs: 4 HP / 252 Atk / 252 Spe  
Adamant Nature  
- Belly Drum  
- Aqua Jet  
- Play Rough  
- Knock Off

Aegislash @ Life Orb  
Ability: Stance Change  
EVs: 4 HP / 252 Atk / 252 Spe  
Adamant Nature  
- Swords Dance  
- Shadow Claw  
- Close Combat  
- Shadow Sneak

Thundurus-Therian (M) @ Heavy-Duty Boots  
Ability: Volt Absorb  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Nasty Plot  
- Thunderbolt  
- Psychic  
- Focus Blast

DD Necrozma HO

by Twilight HD

I wanted to build around Dragon Dance Necrozma after getting smashed by it on ladder. I think this is the most optimal DD set with Heat Wave for Skarmory and Excadrill. It can be hard to stop if the Weakness Policy activates. Lum Berry is a viable alternative though. Lead Excadrill is consistent at getting rocks up. I prefer Rock Tomb as the Speed drop against foes like Autotomize Celesteela is valuable. Clangorous Soul Kommo-o is practically a staple and provides a necessary Ghost resist. Belly Drum Azumarill is a decent cleaner but it's mainly there for its useful typing and priority in Aqua Jet for Pokemon like Excadrill and Mamoswine. SD Aegislash is a strong breaker with a useful typing. Shadow Sneak greatly eases the Latias matchup. Finally, Thundurus-T is extremely difficult to wall and blows through almost every defensive core after a Nasty Plot.

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