Effect Spore is an ability found in certain Pokémon that allows them to inflict a status condition on opponents when they make contact. This ability can cause the target to become paralyzed, asleep, or poisoned, depending on the specific Pokémon using it. The chance of inflicting a status condition is determined by the Pokémon's level and the move used. This ability is particularly useful in battles, as it can disrupt the opponent's strategy and provide an advantage to the user. Pokémon like Breloom and Shroomish are known for having Effect Spore, making them valuable choices in competitive play.