From Bulbapedia, the community-driven Pokémon encyclopedia.
Jungle (Japanese: ジャングル Jungle) is a Friend Area in Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team that can be bought from Wigglytuff in Pokémon Square for 800 Poké. It is in the Jungle Area, and has a capacity of thirteen Pokémon. All Pokémon in this area are Grass-type.
Jungle is a lush, tropical rainforest with a lake at the back. It also has palm leaves and square shaped rocks and boulders covered with moss.
Deep in this overgrown tropical area live many Grass-type Pokémon. The swampy ground is rich in nutrients.