Flower Veil
Protects friendly Grass Pokémon from having their stats lowered by other Pokémon.
In game description
Ally Grass-type Pokémon are protected from status conditions and the lowering of their stats.
Pokemon with Flower Veil
Using Flower Veil in Cobblemon
Abilities are passive and always active, so Flower Veil 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.