White Smoke

Full effect

This Pokémon cannot have its stats lowered by other Pokémon. This ability does not prevent any stat losses other than stat modifiers, such as the Speed cut from paralysis; nor self-inflicted stat drops, such as the Special Attack drop from Overheat; nor opponent-triggered stat boosts, such as the Attack boost from Swagger. This Pokémon can still be passed negative stat modifiers through Guard Swap, Heart Swap, or Power Swap. This ability functions identically to Clear Body in battle. Overworld: If the lead Pokémon has this ability, the wild encounter rate is halved.

In game description

The Pokémon is protected by its white smoke, which prevents other Pokémon from lowering its stats.

Using White Smoke in Cobblemon

Abilities are passive and always active, so White Smoke 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.