I know this might sound crazy, but I would love to call up my friends, have a get together, buy some S.S. Anne tickets, and travel to Sinnoh to visit The Old Chateau at night. I remember, a few years back, my friends and I traveled to a location that was supposedly haunted, and we visited there at night to see if we'd actually see anything supernatural. We didn't, but it was still a fun and scary time simultaneously. We would definitely to the same thing in the The Old Chateau, maybe battle and/or capture the Ghost-type Pokémon that try to harass us, but I have no clue how we are going to deal with the human ghosts.