There are some special QR Codes, such as those obtained from the arcade game, Pokémon Ga-Ole, which give 20 points per scan rather than 10. With the limit, this essentially means you can do one island scan a day.
When you scan a QR Code, you will get 10 points and for every 100 points, you will be able to use the special Island Scan. All QR Codes that exist can be scanned by the game, being read as Wonder Codes and giving you a random Pokémon to your Pokédex
Instead, a scan regenerates 1 every 2 hours, and the game stores up to 10 scans for you to use at any one time. However, you can't just scan every single QR code instantly. Here, you can scan various QR Codes and add the Pokémon as 'Seen' on your Pokédex. The QR Scanner is a new feature that can be found in the main menu of the game. This feature allows for you to scan QR Codes on various items, including screenshots, merchandise and special promotional leaflets, in order to register Pokémon in the Pokédex. The QR Scanner is a new feature in Pokémon Sun & Moon.
