Fog Horns (Ability)

Fog Horns is an Ability. It is the signature ability of the Valeville line, and original to Pokémon Beryl.

Effect
Fog Horns summons fog in battle as soon as a Pokémon with Fog Horns enters the battle. Its effects are the same as the move Cloud Cover, but instead of lasting for a limited amount of turns, it lasts for the whole battle (unless it is replaced by another type of weather). If a Pokémon with Fog Horns is sent out in the same turn as another Pokémon whose Ability affects the weather, the slower Pokémon's Ability will override the faster Pokémon's Ability.