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Howling Forest is a dungeon in Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team. You can unlock Howling Forest by getting the friend area Sky Blue Plains (obtained by randomly doing any rescue missions that say the reward Friend Area). Then the next morning go to the Bulletin Board and a Howling Forest mission request will be there, sent by a Smeargle. Then access to Howling Forest is granted. After clearing it for the first time, you can also recruit the same Smeargle.
Even though Howling Forest isn't really that hard of a dungeon you get 100 rescue points every time you do a regular mission.