go to nimbasa citythen on the right of the musical go through route 16 and it is closed to get through you have to defeat n in the final battle then it is open you can find swanna on the bridge too
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.
At the marvelous bridge on the right side
yes, but only one at marvelous bridge. On the bright side rotation battles are common in black.
Annihilate the Elite 4 twice, go to Nimbasa, head up and then right to Route 16. Get to the end of it and enter Marvelous Bridge.
The Marvelous Bridge is between Routes 15 and 16. East of Nimbasa City and west of Black City/White Forest.
Beat the Pokemon League
There is a guy who will sell you one on marvelous bridge.
Before Black City and after Marvelous Bridge.
Take a gengar to her and you'll find out
It's a lady who is a girl that is weird
Go to the marvelous bridge and you can catch one
It can be found on Driftveil Drawbridge or Marvelous Bridge.
At the marvelous bridge on the right side
on marvelous bridge a guy will sell you a magikarp for 500 hope i helped
A merchant sells it to you on the Marvelous Bridge for 500 coins,dollars,or whatever you call it.