http://www.newsweek.com/pokemon-pass-shiny-pikachu-eevee-lets-go-1411307

A new Pokémon mobile app will make it much easier to receive specially distributed Pokémon.

Pokémon Pass grants players access to exclusive content including wallpapers, digital stickers and the aforementioned special Pokémon. Pokémon Pass is available to download for free on iOS and Android. Once players have it all they have to do is simply walk into a participating retail store to receive special Pokémon when they are distributed.