Pokémon Mystery Dungeon: Blue Rescue Team and Red Rescue Team/Uproar Forest

Once you reach the 10th floor you will find the Mankey gang. Afterwards everyone will return to your rescue team's headquarters. The Mankeys will help upgrade your teams HQ in exchange for a spiky chestnut. A total of 2 chestnuts will be required to advance in the storyline. If you don't have enough to bribe the Mankeys go for a few more missions in Uproar Forest until you have found some.

Go to the bulletin and take the Smeargle's mission.

In The Dungeon
This is the first dungeon to have the possibility of Monster Houses.

Items

 * Chestnuts Can be found randomly on the 9th floor only

Enemies
Mankeys will not be able to be recruited until after the first completion of the dungeon.