>>46532862I didn't suggest they are your eternal lover or whatever, they are however your devoted and
loyal guard. If they bound themselves to you, that means you are the one they will protect for the rest of their days, you can trade them away or they can leave, but the bind is ever eternal, it cannot be broken. Their lifespan is still tied to whomever they bonded to no matter the trainer they are with.
And of course their is no official wording on this, we don't even know their canon lifespans. I just like the idea of these guards having a super strong bond with their partners (be it human or Pokemon).