So a certain user commented on how in PokeSpe, Pokemon are handed out like candy with no consent on their part despite them being "friends." But it's less like that and more like the Pokemon trust in their trainer that they know what they're doing as they're borrowed by another Trainer. Otherwise, they would've voiced their disapproval then and there. Wouldn't you think so?
Plus, Pokemon aren't "friends" in the sense of "human/human" relationships so much as the kinship between a person and his pet dog.