If you scan enough QR Codes, you also earn points for the Island Scan. From there, you can use your PokéDex to zoom in on that Pokémon’s stomping grounds and catch it.
Scanning a QR code marks that Pokémon as “seen” in your PokéDex. What’s The Point Of Scanning Qr Codes In Pokemon Sun And Moon Not all non-Alola region Pokemon are available through Island Scan, but a number are – including some of the classic starter Pokemon from previous generations of the series. If you do it on later islands, levels will also correspond. If you use it on Melemele island, the first, you’re going to find lower-level Pokemon. You’ll also want to be careful and considerate of where you use your Island Scan. You can only scan 10 QR codes a day and you only get one attempt to catch that Pokemon, so be careful not to knock it out. This basically means you can catch Pokemon that aren’t found in Alola normally in the wild including classic starter Pokemon like Charmander, Squirtle, Bulbasaur and so on, though it’s limited.
Running this scans the island you’re currently on and finds/spawns a rare Pokemon that usually can’t be found in Alola – in real terms making it spawn on that island.
The QR code system in Pokemon Ultra Sun & Moon does have one other major advantage: every ten codes you scan you’ll be able to run an ‘Island Scan’. Pokemon Ultra Sun & Ultra Moon Tips – How To Ash’s QR Code Pikachu
