Not only is it a useful way of cataloguing creatures so you can later locate them in the wild, the system also allows you to catch an additional 28 non-Alolan Pokémon that you can't get anywhere else - until Pokémon Bank support from previous generations is introduced, that is. Pokémon Sun and Moon QR codes allow you to scan codes of (practically) every Alolan Pokémon and add them to your regional Alolan Pokédex.
