Essentially, you pick one Pokémon to be your buddy, once you select them they will appear on your character profile screen. Their position will depend on size so, if they are huge like a Snorlax then they will stand behind you, and if there a little bit tinny tiny like a Squirtle or a Charmander then they will stand in front of you, as if you are walking with this Pokémon. Once you have selected that Pokémon as well appearing on your profile screen it will also live on your world map. So, in the bottom left corner where you normally see your player’s icon head as well as their information, now there will be an extra little orb which will have your buddy’s icon. As well as that, you notice around the buddy’s head there is actually a progress bar, I think that this progress bar is showing you how long it is until you get your next reward.
Now the rewards are a little bit unclear at the moment, the only one that it mentions for certain is candy. It doesn’t mention anything about raising the CP of a Pokémon and it doesn’t mention anything about stardust, it only mentions ‘other helpful bonuses’. Beyond that the only other bit of information which they provided in the blog post is the fact that you can actually switch out your buddy at any time.
This update is now fully available.