Update (June 22): Trading is now available in Pokemon Go for players level 10 and above.
You can see an example trade in the video below:
Original story follows:
Nearly two years after launch, trading is officially coming to Pokemon Go.
Niantic announced this morning that trading will arrive alongside a new Friends system, which will offer various social features online or nearby.
Each player will have their own Trainer Code that they can share with friends to exchange friend requests. Once someone has accepted your friend request, that player will appear on your Friends List, where you can interact in various ways.