Houndoom - TG10/TG30 - Ultra Rare from Sword & Shield: Brilliant Stars, available at 401 Games Canada.

• Rarity: Ultra Rare
• Finish: Holofoil
• Card Text:
  Ability — Single Strike Roar
  Once during your turn, you may search your deck for a Single Strike Energy card and attach it to 1 of your Single Strike Pokemon. Then, shuffle your deck. If you attached Energy to a Pokemon in this way, put 2 damage counters on that Pokemon.
  [1D] Darkness Fang (50)