Go into the Old Chateau and go into the 2nd last room on the right on the top floor go in and out about 5-9 times and she should be in the room on the right looking at you, and then she leaves the room. Dont bother looking for her because you wont find her ; not unless you go in and out of the room again and again.
As for the Butler do the same except go in and out of the Dining Room and he should be there on the other side of the table watching you then he'll float away and you stand there watching him lol
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you have to see all the Pokemon in the pokedeks
The ghosts can't be fought in their current forms. To beat them you have to see them and you can when you get a Silph Scope. You get the Silph Scope in Celadon City somewhere (No spoilers unless u want them)
Pokemon diamond
get it from a honey tree
combee. you can see one is slouther honey on a tree.