I think it is the 9th floor, the middle platform on the map!
fly is not there ....... even i dont know where fly is but i can tell you this much
floor 20 of solar cave
no where
The last floor is floor 20. PS: The HM Surf is on it.
If you think so, your a dumb, stupid, nooby, idiot. Of course not.
there are 19 floors and you need hm waterfall you can get that in solar cave floor 15 after you have received hm surf and dive and 3 link boxes
Surf is on the 20th floor of Solar Cave but you need to be able to cross water to get it.
You can get the Waterfall HM in Solar Cave (with key on any floor or without key on 20F, Look for a place with water in a square).
In the solar cave behind a locked door that you have to unlock with a key
In Pokemon Mystery Dungeon: Red/Blue Rescue Team, link cables are found where important items were once kept i.e. HM's, etc. For example, if you have surf, on floor 20 of Solar Cave, where Surf once was, a link cable will now be there. Important items are found in Solar Cave, Wyvern Hill, Mt. Faraway and Wish Cave.
in the solar cave
After you beat Raquaza, talk to whishcash and he'll give you the hm waterfall and access to solar cave. Solar Cave has three HMs, Dive, Surf, and Waterfall, and you need keys to get all of them. The HMs are on B10f, B15f, and B20f, I don't which HMs are on which floor, but 1 HM is on each of those floors.