Poké-BodyPower Gene
As long as Nidoking is in play, your attacks by Nidoran♀, Nidorina, Nidoqueen, Nidoran♂, and Nidorino do 10 more damage to the Defending Pokémon.
Earth Poison40
If the Defending Pokémon already has any damage counters on it, the Defending Pokémon is now Poisoned.