[quote=pitwhousedtodopokemon]
Bulbapedia never mentioned anything about them.But that does makes me feel better.
[/quote]

[url=http://bulbapedia.bulbagarden.net/wiki/Old_Chateau]According to Bulbapedia,[/url] the only thing Platinum-exclusive about the Old Chateau would be some text in readable books on the floor and the like, which are minor details anyway. The ghosts are implied to be in all Sinnoh games.