No Competitive Ability
I think having if we give it No Guard, we are going to have to seriously limit the kind of moves it can use, as No Guard combined with moves like Blizzard, Megahorn, Stone Edge, Zap Cannon or DynamicPunch would make it far less risky and considerably more powerful than the original idea was meant to be. In addition, illusion and Weak Armour are such great abilities already, adding a third one seems completely and utterly unnecessary.