From Bulbapedia, the community-driven Pokémon encyclopedia.
Noir Forest (Japanese: サマヨイのもり Wandering Forest) is a location in Pokémon Ranger: Guardian Signs.
It is located east of Old Mansion and north east of Mitonga Road on Mitonga Island. Players must avoid the light released by the Dusclops because having the light shined on the player will return him or her back to the entrance. The Dusclops act as bodyguards. They can be captured by running into them from behind. There are many Fallen Logs in Noir Forest. Once all Dusclops are captured, Dusknoir will appear.