Same with aegislash. i dont like aegislash, but i find it ridiculous on why its banned. For the same reasons as mega lucario (another pokemon i believe shouldnt be banned) if you ban for unpredictability, you might as well ban charizard x and y due to them becoming either one and can go both physical and special attacking. I've even ran into some that are insanely desensive. Plus, if you let a pokemon set up on you, its your own fault that you didn't have something to take care of that threat sooner