Click on a Pokémon to view its AR Sticker. After the image displays hold your 3DS camera lens up to the screen and capture the displayed image to save the code to your PokéDex.
Newly added pokemon will first only display as silhouettes with no data available. You will unlock 3 of these pokemon a day and gain access to full graphics and data.
There are a total of 164 Pokémon saved at PLDH.net with AR Stickers.