Ultra Necrozma-GX

Photon Geyser (Psychic, Metal) 20+
Discard all basic Psychic Energy from this Pokémon. This attack does 80 more damage for each card you discarded in this way.

Sky-Scorching Light-GX (Psychic, Metal)
You can use this attack only if the total of both players' remaining Prize cards is 6 or less. Put 6 damage counters on each of your opponent's Pokémon. (You can't use more than 1 GX attack in a game.)

Pokémon-GX rule: When your Pokémon-GX is Knocked Out, your opponent takes 2 Prize cards.

Weakness: Fairy ×2 · Resistance: none · Retreat: 2