Aegislash @ Weakness Policy
Ability: Stance Change  
EVs: 240 HP / 20 Def / 248 SpA  
Quiet Nature  
IVs: 0 Spe  
- King's Shield  
- Shadow Ball  
- Shadow Sneak  
- Flash Cannon / Metal Sound / Laser Focus

Aegislash @ Occa Berry  
Ability: Stance Change  
EVs: 248 HP / 216 Atk / 44 SpD  
Adamant Nature  
- Head Smash  
- Magnet Rise  
- Shadow Sneak  
- Iron Head

Aegislash @ Literally whatever you like
Ability: Stance Change  
EVs: 248 HP / 252 Atk / 8 Def  
Brave Nature
IVs: 0 Spe
- King's Shield  
- Head Smash  
- Iron Head  
- Shadow Sneak

Aegislash @ Air Balloon
Ability: Stance Change  
EVs: 248 HP / 92 Atk / 168 Def
Relaxed Nature  
IVs: 0 Spe  
- King's Shield  
- Sacred Sword  
- Shadow Sneak  
- Swords Dance / Flash Cannon