why are the side rooms in the diamond pokemon mansion blocked off?

Question

I have the national pokedex but am unable to enter the side rooms. Do they ever come unblocked?

Answer 1

>The western and eastern exits of the mansion are blocked by the maids. Neither of these doorways are functional, and only serve as decoration, as players with Action Replay have proven.
Bulbepedia

So no, they don't come unblocked, they're only for decoration.