The Pokédex QR codes allows you to automatically mark a Pokémon as seen in your Pokédex.
There are actually two kinds of codes, and they do not work the same way. Pokémon Sun and Moon introduces a brand new feature: QR codes. Looking for Pokémon Ultra Sun and Ultra Moon QR Codes, Serial Codes, distributions, and events? Click here! Pokémon Sun and Moon – QR codes
NB: Don’t forget to download the latest update if you want to keep using the online features: click here for more details. Latest update: Fennel’s Munna Serial Code (worldwide) On this page, you will find the complete list of QR codes, Serial codes, events, and more for Pokémon Sun and Moon!