You can go in the Old Chateau more than once.
its in the eterna forest.
go to old chateau
trade rotom from platinum
There is no basement of the Old Chateau.
no
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It in the northern most part of Eterna Forest.
the old chateau in platinum is where you get rotom and it is the shut down place where they made gateau
there is one in the old chateau in etrna forest
the old chateu is only in Pokemon diamond pearl and platinum versions
At the end of Eterna Forest, right before Eterna City.
You can catch Rotom by gettin the Secret Key in Mystery Gift.