Cloud Nine
Negates all effects of weather, but does not prevent the weather itself.
Full effect
While this Pokémon is in battle, weather can still be in play, but will not have any of its effects. This ability functions identically to Air Lock.
In game description
Eliminates the effects of weather.
Pokemon with Cloud Nine
Using Cloud Nine in Cobblemon
Abilities are passive and always active, so Cloud Nine costs you nothing to run. If it is marked hidden on a species above, expect it to be harder to obtain: servers differ in whether hidden abilities come from breeding, an Ability Patch, or events.
See the Pokedex for which abilities each species can have, and IVs, EVs and breeding for how to actually pass one down.