In Goldenrod City there is a woman who will tell you the amount of happiness of the first Pokemon in your party. She doesn't give you a specific number, but you can have a general idea of it: "It doesn't seem to like you at all. It looks mean." Your Pokemon's happiness is between 0 and 49. "You should treat it better. It's not used to you." Your Pokemon's happiness is between 50 and 99. "It's quite cute." Your Pokemon's happiness is between 100 and 149. "It's friendly toward you. It looks sort of happy." Your Pokemon's happiness is between 150 and 199.