black and white's zorua event without having celebi in your team or using the relocator. require an action replay device for ds, codes also work on a dsi action replay. codes may or may not work if using a flashcart. if using a rom they work fine and if you haven't updated your action replay ds/dsi the codes won't work. visit the codejunkies website on how to update your ar.
Black Game I.D: IRBO-106820A5 (EU/US)
White Game I.D: IRAO-0F0875FE (EU/US)
Pokemon Black or White: (press start+select) go to castelia city and enter the game freak building talk to zorua and voila. you can even redo the event over and over for multiple zorua.
extra: every pokemon in your party earns EXP and EV even without participating in battle, a damn useful code dammit.