Tapu Koko-GX#SV93 · Hidden Fates Shiny Vault

When you play this Pokémon from your hand onto your Bench during your turn, you may move any number of Lightning Energy from your other Pokémon to this Pokémon. If you do, switch this Pokémon with your Active Pokémon.

This attack does 50 damage times the amount of Energy attached to all of your opponent's Pokémon. (You can't use more than 1 GX attack in a game.)