Standard Naga (Naganadel) @ Dragonium Z  
Ability: Beast Boost  
Level: 50  
EVs: 20 HP / 236 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Nasty Plot  
- Fire Blast / Flamethrower 
- Draco Meteor  
- Sludge Wave  
Naga can forgoe some coverage in this set to run substitute, also use other z-moves, but this is the most common set. HP to live 3 stosses, if not too important take out hp put spa

Scarf Naga (Naganadel) @ Choice Scarf  
Ability: Beast Boost  
Level: 50  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
- Dragon Pulse  
- Sludge Wave  
- Fire Blast / Flamethrower 
- U-turn  
Standard scarf naga, uturn for momentum

Wallbreaker Naga (Naganadel) @ Dragonium Z  
Ability: Beast Boost  
Level: 50  
EVs: 20 HP / 4 Def / 252 SpA / 60 SpD / 172 Spe  
Timid Nature  
IVs: 0 Atk  
- Draco Meteor  
- Nasty Plot  
- Sludge Wave  
- Fire Blast / Flamethrower 
Special attack = speed so naga can get spa beast boosts and +1 z-draco kos spdef hippo, Rest dumped in spdef/hp for chansey