You needed to obtain the mystery gift "Member Pass" from an event. This event allowed you to go to full moon island to catch Darkrai.
Chat with our AI personalities
by eating cheese!!!!
you need to get a Nintendo event
You cant open the door.unless you have the Members pass which allows you to get Darkrai. and you can gat the pass only by a wifi event. hope this helps :)
you go to any city then go in the poke mart then go to canalave then the door should be open but you need the national pokedex
You need action replay or go to an event if you want to do this.If you open the door rest into the bed.You'll be on new moon island.enter a little doorway,then...you'll see Darkrai!!