Mt. Snowfall

Mt. Snowfall is a place in Pokémon Channel. There is the Ruins of Truth right of it and it can only be visited after 5 days of playing the game. At first when you arrive there, there will be a Gengar blocking your path so that you can't enter. You will need the Duskull Lamp to enter the Ruins of Truth. To get the Duskull Lamp, talk to Duskull on Springleaf Field.