Snow Cloak

Increases evasion to 1.25× during hail. Protects against hail damage.

Full effect

During hail, this Pokémon has 1.25× its evasion, and it does not take hail damage regardless of type. The evasion bonus does not count as a stat modifier. Overworld: If the lead Pokémon has this ability, the wild encounter rate is halved in snow.

In game description

Boosts the Pokémon's evasiveness in snow.

Pokemon with Snow Cloak

Using Snow Cloak in Cobblemon

Abilities are passive and always active, so Snow Cloak 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.