One time, I was playing a Flareon deck and I only needed to KO the full HP Mewtwo EX in the active to win. I had a Trevenant active with only 10 HP left, and a Flareon on the bench with a DCE. I still needed like 6 more pokemon in the discard to OHKO with Flareon. So I attached a rainbow to Trevenant, knocking him out. Then I Junipered away two more pokemon and then used two ultra balls to get rid of enough pokemon to exactly knock out the Mewtwo.