is an ability introduced in Generation III
. It prevents weather effects.
When the Pokémon with this ability enters the battle, all effects of weather are negated (though the weather itself does not disappear).
In Generation V, when a Pokémon with Cloud Nine is brought out, the message "The effects of weather disappeared." will be displayed.
In extremely harsh sunlight, heavy rain or a mysterious air current, Sunny Day, Rain Dance, Sandstorm and Hail will still fail if used and Abilities Drought, Drizzle, Sand Stream and Snow Warning fail to activate. All other weather conditions are negated by Cloud Nine.
Pokemon with this ability