Where is the ghost guy on Megaman battle network white

Oh boy. Which one? There are dozens of "ghost guys." I hope you mean the guy dressed like a ghost Navi: he'll give a Poltergeist chip after you beat the game and can be found in the hospital basement behind the tree. If you mean ghost Navis, well, there are . . . how many did I say again? Oh, right. Dozens. The ranked Navis up to 7 are ghost Navis, the Navi who gives you the Legendary Tomes job is a ghost Navi, and just about every Navi in the Secret Area is a ghost Navi. Kinda hard to tell you where they all are. Specific locations for the ranked Navis are available under different questions, and the Navi for job 21 is in HadesNet.