Stay out of sight and wait

You decide it might be best to stay out of sight and surprise your childhood friend. You move back and wait over with some other people as Green finishes with the Nurse and heads to one of the rooms that the Pokemon Centers have. You quickly get your four Pokemon healed and ask the nurse what room your friend went to. After explaining that you two are friends the pink haired nurse points you in the direction of your destination. Soon enough you get to her room, which is at the end of the hallway. Once outside of Green's door you think about your next move. You could just knock like a normal person, which will probably lead to a challenge or just her wanting to talk, or you could sneak in and see what your childhood friend likes to do behind closed doors.