There are a few ways to get Zorua. Two of the ways are by event, and the other is by GTS. The first and most direct way, is to have the Event GameStop Celebi. You transfer it into Pokemon White or Black, and it will activate an event, in one of the buildings of Castelia City, the particular building where the girl shows you the picture of Zorua.
The next way is to have the event shiny legendary beasts. Transfer them into Pokemon Black or White and battle and catch Zoroark at Lostlorn Forest. Breed it to get Zorua.
The last way is to get Zorua at GTS. This is probably the easiest way, as Zoroark and Zorua are breedable, and there's tons on the GTS. An easy way to get them is to first talk to the girl with the picture in Castelia City, and then put up a version exclusive Pokemon, a starter, Dream World Pokemon or previous gen Pokemon, and those are pretty much guaranteed to be taken in a few hours to a day, sometimes in less than in hour in my case.
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Its an event pokemon in castelia city;~]
zorua evolves into zoroark at level 100.(just kidding,level 30.)
you cannot catch it. but you can breed zoroark to get it as an egg.
In order to get a Zorua, you must first have a special celebi that was given out. Then you must transfer it to Pokemon Black/White using the Pokemon Relocator. Have celebi first in your team and head to one of the buildings in Castelia City. Zorua is disguised, but is next to a female character on the bottom floor.
you can not get Zorua on soul silver and heart gold but you can get it in black and white version that will come out 2010 in japan and 2011 in England and America