If the Defending Pokémon already has at least 2 damage counters on it, this attack does 20 damage plus 30 more damage.
Abilities
Stages of Evolution
Poké-Body
As long as Hitmontop is an Evolved Pokémon, is your Active Pokémon, and is damaged by an opponent's attack (even if Hitmontop is Knocked Out), put 2 damage counters on the Attacking Pokémon.
Disclaimer: The following data is based on sale history from a third party source. Data is updated about every 5 days. This data does not serve as a value guarantee.