Games : Is there a point to interacting with Pokemon in your lobby/city area?

When walking up to Pokemon in the area outside the castle, they give a message bubble with a neutral face. It looks kinda like '_' If I push A next to them, they will perform an animation and their message bubble will change to a happy face. There was also one time where the interaction ended with a happy face with hearts for eyes, though I don't remember which Pokemon were interacting.

Does this do anything? It seems that every time I come back to this area, all the statuses are reset to that neutral face.