"Blissey, Bliss!" It spoke, amazingly healing a pokemon with its abilities. You were taking over for Nurse Joy, as she was sick. And since you had a Blissey of your own, you could help out at the Pokemon Center as Nurse Joy's own Blissey made sure she would heal up to perfect health.

The pokemon that was healed left with its trainer after they both thanked you. Blissey looked at you, smiling and awaiting some sort of praise.