When used from the Bag in a wild encounter, it attempts to catch the wild Pokémon with a catch rate modifier of 1×. If caught, the Pokémon's friendship is set to 200. (It has no effect on the friendship of Pokémon hatched in a Friend Ball.)
If used on an Ultra Beast, the catch rate modifier is instead always set to 0.1×.
The Friend Ball cannot be used in situations in which Poké Balls cannot be used, such as in wild battles with two or more opponents currently present or against a trial Pokémon. If used in a Trainer battle, the opposing Trainer will bat the ball away, wasting the item.