The nightmare Then the spacial rift(also known as the sky rift)
There are 19 floors in Mt. Travail~Ninjachoco~(19)
20 i think
There are 20 floors in Mt Travail. You can only go with your Partner Pokemon, not your recruited friends.
Drowzee is at the top of the Mt Travail dungeon.
no there is not a boss and here is something that might help you Pokemon explorers of time, darkness, and sky all do not have bosses.
Mt. Travail 1F - 19F Very Rare
You get Darkrai at Mystifying Forest 13F, Crevice Cave Deepest Part B2F, Miracle Sea B3F or Mt. Travail B17F
You go into azurills nightmare, go to spacial rift and fight darkrai in dark crater. After you beat darkrai, you can evolve.
After finishing Aegis Cave, wait about 3-5 days, and Bidoof will come looking for you asking you to come to the Guild. Appears that Azurill has a nightmare, and Mt. Travail will be unlocked.
To get there, First, you should have already freed Manaphy into the sea. Second, go on a couple of jobs and one morning, Bidoof will appear at Sharpedo bluff to tell you about Azurill not waking up. Third, you'll need to get Drowzee ( the first outlaw you captured) because he may be able to enter others dreams and Magnimite will tell you where he is which is Mt. Travail!
20F
19 or 20