The chansey is a highly intelligent species, and while we have a hard time learning their language, due to the fact that our vocal cords aren't the same as theirs, they have shown a great aptitude for learning our language and several of them have entered our society at various places. They are curious and loves to lend a hand, for any or no reason.
This should not be mistaken for gullibility, because they have a nack for spotting hidden agendas, so trying to trick them could have you end up with a big fat hand imprint on your cheek, something to be wary of since they are surprisingly strong for such a peaceful species.
What puzzels scientists the most is however their ability to calm aggressive feelings. They seem to do this simply by being present. This has earned them positions at hospitals and even some prisons, though very few chanseys take up on such a job offer. They are probably easily disturbed aggressive emotions, as some humans are.