Battle Armor
Protects against critical hits.
Full effect
Moves cannot score critical hits against this Pokémon. This ability functions identically to Shell Armor.
In game description
Hard armor protects the Pokémon from critical hits.
Pokemon with Battle Armor
Using Battle Armor in Cobblemon
Abilities are passive and always active, so Battle Armor 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.