Foggy Forest (Japanese: のうむのもり Dense Fog Forest) is a dungeon in Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness and Pokémon Mystery Dungeon: Explorers of Sky. It is unlocked after the player has arrived at the base that was set up as part of the search for Fogbound Lake. It has a total of 11 floors, all shrouded in fog. During the player's first visit, he or she must choose between Foggy Forest and Forest Path. If he or she chooses Forest Path, he or she must traverse five extra floors, before getting back to the camp.
There seems to be no connection to items and floor.
Base camp, at the entrance to Foggy Forest
The Groudon Statue, at the end of the dungeon