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Before Black City and after Marvelous Bridge.
Take a gengar to her and you'll find out
It can be found on Driftveil Drawbridge or Marvelous Bridge.
It's a lady who is a girl that is weird
A merchant sells it to you on the Marvelous Bridge for 500 coins,dollars,or whatever you call it.
It relates to the ghost in pokemon white 2/black 2 where she haunts the strange house and in it is the lunar wing and then cresselia will appear on Marvelous bridge if you have the lunar wing.
The PokeTransfer machine is in the PokeTransfer Lab on Route 15.route 15 is near black city (pokemon black) or white forest (pokemon white) and Marvelous Bridge
I dont think you can even though you get the adament orb,the lustrous orb,and the griseous orb from the shadow triad on marvelous bridge.
You have to finish the game( beat the elite 4 and N ) and come back
The Marvelous Bridge is between Routes 15 and 16. East of Nimbasa City and west of Black City/White Forest.
Go to Marvelous Bridge and talk to the mountain-hiking guy that's there. He will sell you a Magikarp. You just need to have a spot in your party for it.
Things you will need. You need to have at least one free space in your party and at least $500. How to get it. Go to west marvelous bridge. Hope this helped.