Place damage counters on the Defending Pokémon until they have the same amount of Damage counters on as Swalot has. If the Defending Pokémon has more damage counters than Swalot, this attack fails.
You may do 50 damage plus an additional 30 damage. If you do, this attack does 30 damage to 1 of your Pokémon. Don't apply Weakness or Resistance to your Pokémon.