There are 3 shadows in the game that I know of. I don't know which one you mean, so I will list the 3 that I know.
1. Shivers the butler ghost, who initially appears as a shadow holding a candlestick.
2. Bogmire, the shadowy ghost who you fight in the graveyard
3. A creepy glitch where, if you stand in a certain position in the Telephone Room, Luigi's shadow on the wall makes it look like he hung himself.
walmart
in the basment
Suck up a Shadow Ghost until it becomes a ball and shoot it at the real ghost then you can suck it up!
trapped in a portrait on the final level of luigis mansion
Yes there will be a luigis mansion 2. Its called the elictric boogaloo
probably in the laundry room
you dont get luigi mansion in the day
Go to VidoEmo.com. there are plenty walkthroughs there.
poltergust 3000
no luigis mansion is on gamecube buy 1 they r cheap 30 $ or so
silly! its Luigis mansion
no one knows yet.