Natural Cure heals any status conditions upon switching out or completing a battle (if it was in battle at the end of the battle).
This effect will occur if Natural Cure is the Pokémon's Ability in battle when it switches out and is not suppressed; a Pokémon that obtained the Ability with Trace will have its status condition cured when it switches out, whereas a Pokémon which has Natural Cure but has been affected by Gastro Acid will not.
All moves used by or against a Pokémon with this Ability cannot miss. It also allows Pokémon to be hit during the semi-invulnerable turn of Fly, Bounce, Dive, Dig, Shadow Force, Sky Drop, and Phantom Force. If a K.O.-Move is used by or against the Pokémon it will also hit.
The only attacks, that are affected by this Ability in multibattles, are likewise either used by or against the Pokémon.
Outside of battle
Outside of battle, if a Pokémon with No Guard is in the first place in the party (even if fainted), the wild Pokémon encounter rate increases by 50%.