>>18939461ebin smogon set names xD
Seriously though Shadow Ball/Sneak/Sacred Sword/Kings Shield, 252 EVs in Atk/SpAtk Quiet, 31/31/31/31/31/0 holding a Life Orb or Spooky Plate is probably the best 6v6 set there is. SubToxic isn't bad though. Purely Special can be utilized if you're running Autotomize. Purely physical is WoW bait, especially if you're using SD/KS.
In 3v3 or 4v4 Mixed Aegislash is still probably the best, though Weakness Policy is definitely better here because of the short match duration.