Dipplin - 018/167 - Promo (Cosmos Holo) from Pokemon Miscellaneous Promos, available at 401 Games Canada.

• Rarity: Promo
• Finish: Holofoil
• Artist: Saboteri
• Card Text:
  Ability — Festival Lead
  If Festival Grounds is in play, this Pokémon may use an attack it has twice. If the first attack Knocks Out your opponent's Active Pokémon, you may attack again after your opponent chooses a new Active Pokémon.
  [G] Do the Wave (20x)
  This attack does 20 damage for each of your Benched Pokémon.