The deal we all get when we're brought to this world, so at least I can assure you that everybody's getting the same treatment.

[Nope, he's stuck with it.]

But I guess you don't have to train it? You can just keep it as a pet. But it won't get stronger or evolve if you don't do anything with it. And you're required to have one Pokemon with you at all times if you're exploring this world so you can't drop it off somewhere.