Bronzong - XY21 - Pre-Release Promo from XY Promos, available at 401 Games Canada.

• Rarity: Promo
• Finish: Holofoil
• Artist: match
• Card Text:
  Ability - Metal Links
  Once during your turn (before you attack), you may attach a Metal Energy card from your discard pile to 1 of your Benched Pokemon.
  [1MM] Hammer In (60)