@Speed-X

If you go though the Strange House all the way then you will meet a ghost and she will tell you her story and give you the Lunar Wing. It is said that this is the same ghost that you meet on Marvelous Bridge in BW.

Oh yeah! I remember talking to her in Mt. Pyre. I thought it was strange that she said the same thing that the ghost in Lumiose City. I figure it was just chance but I never thought of her as a ghost. I was expect her to disappear like her other self in XY.