I once took out my friend's team full of legendaries at lv. 100. I had one Pokemon left and he only had the Toys R Us Arceus. It was holding a Life Orb and that caused Arceus to faint and my Pokemon somehow survived the final blow. He was surprised as well and said I actually had him second guessing my next attacks as while I prefer damaging attacks I also threw in a couple of Calm Minds and Work Ups.