there are Keys inside this dungeon pick them up
for the lock boxes i've listed below
Dive = 10th floor + lock box + key to open it
Waterfall = 15th floor + lock box = Key to open it
Surf = 20th floor surrounded by a water barrier
if your the leader & water type then you can just get it
as well it should be located in the top Left corner
of the dungeon
if not there try the middle of the dungeon
if not there try the top right corner..
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).
key door 15F solar cave
The HM Waterfall is available in Solar Cave, on the 15th floor. You need a key to access it, but those are found throughout the dungeon.
floor 20 of solar cave
solar cave floor 20 its hard so bring i strong Pokemon
floor 30 of solar cave
Solar cave on the 15th floor as you go thru the dungeon you'll see Keys on the ground pick them up so you can open the lock on the 10th floor Containing Dive then as you make your way to the 15th floor there's another lock box contain Waterfall open it with the Key you found.
In any floor i found it on floor 2
The last floor is floor 20. PS: The HM Surf is on it.
in the solar cave
Keys can be found on the floor in Solar Cave and Western Cave. They are more frequently found in Solar Cave, though.
1. get a water type Pokemon 2. go to solar cave 20th floor is where surf is