Nidoking

Poison Point

If the Pokémon is attacked by a contact move, it has a 30% chance of causing Poison to the attacker.

Rivalry

Increases damage by 25% against same gender, decreases damage by 25% against opposite gender, and does not change damage when against undefined gender.

Sheer ForceHidden

If the Pokémon uses an attack with an additional effect, the damage of the attack is increased by 30% but has a 10% chance of failing