Bisschen was von Kotaku bezüglich "Buddy":

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Once selected, you must walk somewhere between 1 and 5 kilometers to earn a piece of candy for that Pokémon. Bulbasaur, for example, needs to walk 3 kilometers to earn a Bulbasaur candy. A master list of buddy Pokémons’ candy-per-kilometer stats can be found here.

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It’s like you’re Ash exploring the world with Pikachu, except (disappointingly) you can’t actually see the Pokémon following you around. The monster appears in a little icon next to your player icon, unless it’s actually Pikachu, who—true to form—does walk with you.
Und wohl als spaßig gedacht (je nach dem was man witzig empfindet):

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I am here to tell you, dear reader, that there is really only one choice.
And that choice is the magnificent Magikarp:
Look at him, that beautiful bastard. After you select Magikarp as your buddy, he appears right next to your avatar. The implication here being that, as you walk, Magikarp dutifully flops next to you, following your lead. Do you know how hard it is to get around like that, when you don’t have actual legs? Magikarp is trying hard AF! Magikarp is doing his best! He wants to grow big and strong, just for you.