Apport

“Trägt das Pokémon kein Item bei sich, hebt es den Ball aus dem ersten gescheiterten Fangversuch des Kampfes wieder auf.”

At any time after the first Poké Ball is thrown and fails to catch a Pokémon, at the end of a turn, if a Pokémon with Ball Fetch is on the field and not holding another item, it will pick up the same type of ball as the first one thrown.