The ghosts are the family of... Well, let me explain it. On Pokemon platinum, you catch rotom and you can put him in a MOTOR of a household item. If you read the diary in the same room (the old one) it will probably explain a few things.
(WARNING!!!!!!!! THIS ANSWER CONTAINS SPOILERS)
So ROTOM was in a toy robot at first, owned by a kid. My idea is either-
The kid lived in the old Chateu witht he old person
The kid is the old person who has a granddaughter
It's an illosion.
Why are they coming out? Well, ghosts like to repel people from their place where they live or they're disturbed by something. EXAMPLE, finding their old pal. Which si where ROTOM comes in. If you think about it, it makes sense!
ghastly,rotom
The ghost is gengar.
There one-time ghosts in the old chateau, but these dont do anything.
no shes just scared of ghosts
no
Ghosts are probably in the Old Chateau because that is one of the only places to catch them in Diamond, Pearl, and Platinum. Also, the Old Chateau is abandoned which explains why ghosts have taken up its residence. ~KKMG1
yes, the old chateau contains wild ghost types AND a free old geateau, too! Its like a moomoo milk!
There are two ghosts in the Old Chateau. The first ghost is the butler that can be found in the dining hall, and the second ghost is the little girl in the bedroom on the far right on the second floor.
There is no granny in the Old Chateau in Pokemon Diamond. The only NPCs that appear here are two ghosts you can't interact with.
when you see people in the old chateau there ghosts look at there feet the float and disappear go to the tv room to find rotom at a certain time i think its 8pm and after
No reason at all. The game is just telling you that the old chateau is haunted.
There is only one that I know of,and it is the little girl that appears when you are in the room next to her and disappears when you enter the room she was in.