This is a creepy mansion said to be haunted. Ghost-types reside here, and love to scare any other person or Pokémon that are brave enough to come here. As the legend goes, Trainers or Pokémon go missing here if they enter, but it's just a myth used to prevent the wanderer from entering the house.
It is also said that a mysterious, dark Pokémon resides here. All other Pokémon are scared of it, but no one has ever seen the Pokémon. Whoever has - and this is but two Trainers - were called liars. It is unknown if such a Pokémon lives here.