LogFAQs > #960664872

I think there's some kind of haunted house with a rotom? Rotom triggers all the electronics, but a ghost is seen around the house.

The one on the bridge is in B2W2, I think. Been too long since I played that. At least if it's a faithful remix, the TMs will be reusable.

Edit: Cool, memory is still good.
Rotom Spooky House: https://bulbapedia.bulbagarden.net/wiki/Old_Chateau

Occasionally, the ghosts of a little girl and a butler appear in the rightmost bedroom on the second floor and in the dining hall, respectively. They cannot be interacted with and move by floating.

Spooky B2W2 Bridge: https://bulbapedia.bulbagarden.net/wiki/Marvelous_Bridge

During certain occasions, the spirit of a deceased young girl will be standing on the bridge, and will disappear if the player walks towards her. An old lady in the gate to the east of the bridge will explain that the young girl used to play around the area with an Abra before the bridge was built. In the sequels, the girl will also appear in the Strange House, where she will refer to Abra and the bridge before telling the player to return the Lunar Wing there, which will trigger a battle with Cresselia.

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Crystal Maiden... gal could break your heart in a thousand pieces. -Rucks