first you have to talk to sunflora a few days after you beat the guild then talk to Mr. Mime next to the kecleon shop and he'll talk about scizor being trapped in a block of ice at crevice cave. Once you get to the there, you have to battle froslass then when you save scizor, a few days later after beating froslass, talk to sunflora at the guild, then she'll talk to you about surround sea and will gain access. Then when you get to the 20th floor, you will find the wonder egg.
48 floors
The Nightmare has 17 floors.
The Temporal Tower has 23 floors in "Pokémon Mystery Dungeon Explorers of Darkness."
There is 20
19
48 floors
=20 Floors=
13 floors
20 floors
there are 15 floors to this dungeon and a sandstorm on floors 6,10 and 11
there are no floors........Uhhh.....There are 50 floors. :))
actually it is 11 or 12 floors