What to do in the old chateau?

Forest Manor) is an abandoned mansion near the exit of the Eterna Forest. Inside one of its four bedrooms, there is a television, which, if interacted with at night (only after obtaining the National Pokédex in Diamond and Pearl), will initiate a battle with the only obtainable Rotom in the game. Cut and, by extension, the Forest Badge, are required to enter the Old Chateau.

The Old Chateau is a very strange house located deep within the Eterna Forest, near the western entrance, only accessible by HM01 (Cut). The mansion is known to be haunted, scaring many citizens of Eterna City, especially Gardenia, who sometimes appears before it cowering in fear at the urban legends related to it. Upon entering, the Old Chateau appears to be old and abandoned.

The first room encountered is the foyer, which has two flights of stairs both leading to the first floor. Between the foyer's staircases is a door to the dining hall, where a long wooden tables dominates the room.