There are 10 floors to go through on Mt. Thunder. That take you to Mt. Thunder peak, which has 3 floors.
Mt. Moonview is a special friend area that can be obtained only throug a mission, you can unlock it with this Wonder Mail: 2?2K WH0? ?R77 0+?T 64F0 P??W
As far as I know, there isn't one. You have to get it from making drinks in Spinda's Cafe. Sorry, I'm trying to get it from there as well.
You get the places after you rescue the Pokemon frostlass froze on blizzard island and getting the secret rank, then on random days the Pokemon that give you the jobs will give you jobs that tell you to get the seven treasures, one at each place. (mt. avalanche (20 floors), giant volcano (20 floors), mystery jungle (30 floors), bottomless sea (50 floors),shimmer dessert ( 40 floors), world abyss ((50 floors),and sky stairway. (50 floors ) then search "what to do after the seven treasures on Pokemon mystery dungeon.
Make drinks in spinda's cafe. I am unsure of how many...
20 floors
You have you make drinks at the spinda cafe
Mt. Mistral 18th or 19h floor with the mystery part or secret slab in your bag
keep doing jobs then you will see a mission new dungeon discovered hopefully hope it helps
You go to Mt. Mistral and he should be there, take a Mystery Part and Secret Slab just in case.
get a secret slab or mystery part then go to Mt. Mistral floor i think 18. you will have to look through that whole floor looking for it. also make sure you have gotten the dungeon marine resort before you do this
The legendary bird Ho-Oh is found on the 19th floor of Mt Mistral after you complete the Explorers of Darkness plot. You must be holding either the Secret Slab or the Mystery Part in order to encounter Ho-Oh.
You can find Ho-Oh on the 19th floor of Mt. Mistral if you have Mystery Part or Secret Slab in the bag.
There is 20
Articuno
In Mystery Dungeon Red, Blue, and DX, you go to Mt. Faraway. You’ll find him on the 60th floor.
Mt Minstral