Stench

Introduced in Generation III

This Pokémon's damaging moves have a 10% chance to make the target flinch with each hit if they do not already cause flinching as a secondary effect. This ability does not stack with a held item. Overworld: The wild encounter rate is halved while this Pokémon is first in the party.

“By releasing a stench when attacking, the Pokémon may cause the target to flinch.”