you will need another ds. In Pokemon black use either the relocator or the Pokemon transfer lab. on the other ds have the game with celebi in it. Then press ds download play in the menu then you turn the ds on. Click on the file that has your trainer id on it. Then you select the Pokemon i think and the rest is explained.
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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.
Its an event pokemon in castelia city;~]
To get zorua without celebi you can either get zoroark with shiny entei, raikou, or suicune or you can bargain with someone over wi-fi
Celebi.
Transfer Celebi that you have obtained through DS event on Diamond/Pearl/Platinum/Heartgold/Soulsilver to White or Black versions. Then there is a lady who you talk to with Celebi in the first slot of your party. She will notice it and give you the Zorua. I'm pretty sure that's how it works. Hope it does.