BW: BEHOLD. I am.... Zoruark. I have an exclusive ability and my own movie. You see those guys I hang out with? They're legendary Pokemon. Shiny legendary Pokemon. Hope you have one, otherwise you have no chance of even seeing me. Nothing personal, kid.
BW2: You can finally use me now, but ONLY after the most important character in the entire region bestows you upon me, like the three wisemen bestowing gifts upon Jesus.
XY: I live next to these trash cans.
Zoroark is one of the most strangely promoted Pokemon ever. Why they decided to have a storyline with Gen II legendaries I have no idea. I know the remakes came out right before BW but it's a new gen. Maybe they tried to emulate the Lucario/Mew thing, but that was only in the movie and Lucario had his own different story in DP. Game Freak realized how no one liked being unable to even use him in BW despite all the promotion and just swept him aside the first chance they got. What's also hilarious in that in the Pokemon TCGO, there is a Dark-themed deck you can buy with Zorua. Only Zorua. He has a move that lets you search your deck for any card and put it in your hand, so his only real function is helping you find better Pokemon. Zoroark is not even in the deck because Zorua's ability is vastly more useful than anything Zoroark can do.