If you want to see an old man with a ghost Pokemon because you need to see a ghost Pokemon for your pokedex, well, there's a gym leader with 3. If you need to see this PARTICULAR GUY, then (wait, first I don't know why because I've beaten Platinum without finding an old guy with a ghost Pokemon, but) go back to the places you've been and explore everywhere. The world is a big place. It might take some time.
ummmmmmmmmmm dude i dont think he goes anywhere just u cant see him anymore
you can go to all the regions. First tou have to beat the battle frontier and find this old man with a ghost Pokemon and then you go home and you will find may.and you will get to battle any were.
Ghost,at least that what everybody says
the girl and old guy are ghost i think you can talk to them
You can get a black belt from a man in a residence on route 221
the trainer that has bagon in platinum is at the cave where u find heatran the old man near the entrance to heatran has it
In veilston city behind the Pokemon center in that house that man gives you a porygon
you find the old man in your big fat looser head....idk find him yourself...lol :]
you can nickname your Pokemon in eterna city, located in a house on the right side of the pokemart, when you enter you'll find an old man
fisher man
You need to have seven badges and you need to beat Cyrus and face Giratina in the Torn World. To find out how to do that, look on www.psypokes.com and go on the Pokemon platinum walkthrough.
You can find this man in the place where you trade coins for prizes.