What are the parts of a house and its function?

The mansion is unaccessible, except for the main entryway, the rooms off of that entryway, and the trophy garden out back. Even while using an Action Replay and the walk/run anywhere cheat, it is impossible to explore the rest of Mr. Blacklot's Mansion. A rumor that I have heard, however, states that Nintendo may have an event, where the rest of the coding for the mansion is added, and a fifth generation Pokemon will be available. That, however, is only a rumor.