To be honest, in Pokemon pearl,diamond and platinum, its all the same number of floors, 5 floors. ^_^
There are 11 floors.
20 floors for the cave dungeon10 floors lower cave 14 floors
11
aegis cave all floors except for after you pass registeel chamber
There are 15 floors in the quicksand cave.
11 floors
10 floors
THERE are 13 floors
there are 8 floors
20 FLOORS
There are 5 floors.
You can find unown in solaceon ruins (cave in solaceon town ). There are many different unown forms in there, but i guess you will find what ur looking for ! : - ))