Poliwrath

Once during your turn (before your attack), if Poliwrath is on your Bench, you may flip a coin. If heads, take all Energy cards attached to your Active Pokémon, if any, and attach them to Poliwrath. Then switch Poliwrath with your Active Pokémon.

Water Punch

40+

Flip a number of coins equal to the amount of Water Energy attached to Poliwrath. This attack does 40 damage plus 10 more damage for each heads.