From the Super Mario Wiki
The Parlor is the second room Luigi visits in the game Luigi's Mansion. At the beginning of the game, a Gold Ghost drops the key to the Parlor in the main part of the Foyer. When Luigi enters the Parlor, a Gold Ghost attacks him, but Professor E. Gadd comes and rescues him with his Poltergust 3000. E. Gadd teaches Luigi how to use the Poltergust. When Luigi blows out all of the candles in the room with his Poltergust 3000 and makes the Parlor dark, the paintings in the room will come to life and let loose several ghosts. After he defeats them, he gains the key to the Anteroom.
Ghosts in The Parlor
Ghost in The Parlor in the PAL Hidden Mansion
Ghosts in The Parlor during the Blackout
Names in other languages