I would suggest a moveset something like this:
Aegislash (M) @ Steelium Z
Ability: Stance Change
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- King's Shield
- Iron Head
- Shadow Sneak / Shadow Claw
- Sacred Sword
King's Shield is fairly self-explanatory. Iron Head is for that STAB, and so is Shadow Claw. However, you could use Sjadow Sneak to patch his/her/its mediocre speed a bit. Sacred Sword is for coverage. Also, Steelium Z means a 160 Base Power Corkscrew Crash coming off from a base 150 Attack...
Ouch!