Pokémon GO will be getting a live AR multiplayer feature sometime soon. Currently called "Buddy Adventure," the feature will allow two players to interact with each other's Buddy Pokémon in real-time through their smartphone cameras. The feature is based on developer Niantic's real-time AR networking technology.
https://www.notebookcheck.net/Pokemon-GO-to-get-live-AR-multiplayer-feature-called-Buddy-Adventure.441394.0.html