Mystifying Forest

Mystifying Forest (Japanese: しんぴのもり Mysterious Forest) is an unlockable dungeon in Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness and Pokémon Mystery Dungeon: Explorers of Sky. It has 14 floors and can be unlocked by defeating Dialga at Temporal Tower to end story mode.

It is essential to complete this dungeon to pass the player's Guild graduation test, in which the player may not bring other team members except their partner. At the top the player and partner encounter posing as the "Grand Master of all things Bad", with the other Guild members (with the exception of ) posing as his minions. After defeating them and Wigglytuff commending the player and his/her partner on defeating the group, he then claims to know nothing of the sort and his suspicious example is followed poorly (but successfully) by the other members. Clearing the dungeon will also give the player access to evolve Pokémon if they are under the correct conditions at Luminous Spring. The protagonist Pokémon and his or her partner will be unable to evolve, however, until the final boss of the main storyline is defeated.

Mystifying Forest also has two other bosses, and, that will only appear after the player has talked to  about the Marine Resort and while the Mystery Part or Secret Slab is in the bag.

Traps encountered
In this dungeon, players will encounter some more new here. This includes the PP-Zero Trap, Grimy Trap, Mud Trap, Sticky Trap, and Seal Trap, which makes it more difficult, especially losing all on a PP-Zero Trap, having a food item turn into Grimy Food on a Grimy Trap or even having an item become unusable with a Sticky Trap.

In other languages
Verwirrwald Forêt Trompeuse Foresta Inganno しんぴのもり 神秘森林