Chansey (3/102) [Base Set] Collector's Stash Drifloon does 50 damage to

Drifloon does 50 damage to itself

Pokémon-EX rule

you may move 1 damage counter from one of your Pokemon to another as long as you don't K-O that Pokemon

Mime (after applying Weakness and Resistance)

then put those cards on top of it in any order

Chansey (3/102) [Base Set] Collector's Stash Drifloon does 50 damage toCard Number Rarity: 3 Holo Rare Card Type HP Stage: Colorless 120 Basic Attack 1: [2] Scrunch Flip a coin. If heads, prevent all damage done to Chansey during your opponent's next turn. (Any other effects of attacks still happen.) Attack 2: [4] Double edge (80) Chansey does 80 damage to itself. Weakness Resistance Retreat Cost: F P 30 1