Greninja & Zoroark-GX #200/214

Dark Pulse

30+

This attack does 30 more damage times the amount of Darkness Energy attached to all of your Pokémon.

Dark Union-GX

Put 2 in any combination of Darkness Pokémon-GX and Darkness Pokémon-EX from your discard pile onto your Bench. If this Pokémon has at least 1 extra Energy attached to it (in addition to this attack's cost), attach 2 Energy cards from your discard pile to each Pokémon that you put onto your Bench in this way. (You can't use more than 1 GX attack in a game.)