I don't believe they will transfer to POP. And I'm not sure if POP will deliver to the Dolphin. The issue is that the S/D are not Disney owned resorts. Since they are so close to each other, I would be very tempted to just get a cab and move my own bags. I have done the luggage transfer twice now, and it takes way too long for me. I like to be able to have my bags midafternoon, and that wasn't the case either time.