Ok this again is goin to be somethine that has came up recently in one of my battles. Ok my opponent has a lavitar (RR) with 10 hp left and i have a Sharpedo (SW) with 20 hp left and i also have a piplup on the bench with only 10 hp left as well. K we are both down to one prize card each he attacks using rock slide to kill off my sharpedo with the intial damge then with the second effect picks off my piplup but at the same time when he damaged my sharpedo his pokebody rough skin did 20 damage to his lavitar. Now does he win because he knocked out two of my pokemon, to me only knocking out his one or is it sudden death and jus for record we both still had basic to send up.