About 50.
there are 17 to be honest
15 then 9
Well theres 19 floors+1
There are 49 floors and Raquaza is on the 50th floor. Raquaza won't be recruited on your first go at the dungeon. You'll only receive the Sky Melodica on your first go. To recruit Raquaza you will need to go through Sky Stairway again
go through 30 floors and then beat mew
go through 30 floors beat mew then your done
go through 30 floors then beat mew on the 30th
Destiny tower, much like Zero Isle East in PMD2 has 99 floors, and you are unable to bring items, partners and you start at lvl 1
When switching floors, (When the screen says like Town city floor 1 Hold down LR
You need Wonder Mail. If you have Mystery Part or Secret Slab, you can recruit Latios on the 24th floor. There are 25 floors. You also get Rotom on the 10th to 20th floors.
You have about 24 floors until you get to the room with the Kanghastan rock. You then have another 8 floors to get to Rayquaza. Then, you have to defeat Rayquaza. I suggest lots of sleep seeds and stun seeds. Orbs are no good in boss battles, as a mysterious power prevents their use.
Raquaza