Question

i am talking about the mansion under the city of hearthome. EDIT: sorry I didnt specify but what I mean is the maid that blocks the right wing of the mansions exit so what is past it (if you do cheat codes where do you go?)

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.
Source: http://bulbapedia.bulbagarden.net/wiki/Pok%C3%A9mon_Mansion_(Sinnoh)
So they are not even doors so nothing is behind them. They are only decoration