Pokemon Johto Trio Wonder card Importance?

I know we have to transfer the 3 shiny Johto trio into black or white to get Zoroark but do we need there wonder cards too. I know deleting a wonder card won't delete the pokemon but is the wonder card needed for Zoroark or is just the 3 pokemon needed, because I want to get Celebi from Gamestop but will have to delete a wonder card to get it Help please