On the 20th Floor When you rescue medicham, on the 20th floor, but if you lost that one, there is always another one on the 50th floor. (You don't need a key to get it).
Keys can be found on the floor in Solar Cave and Western Cave. They are more frequently found in Solar Cave, though.
No, you can't start with a Jirachi.
I only found the Moon Stone (Solar Cave) Sun Stone is at Solar Cave. Moon Stone can evolve Skitty... not sure about anything else. :P
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).
you get out the charge stone after beating N
The 50th floor. you can also get it from medicam
floor 20 of solar cave
it will be lying around in a floor in wish cave
If you have already rescued the Medicham from Team Meanies in Wish Cave, you can still find another Wish Stone on floor 50 of Wish Cave.
solar cave floor 20 its hard so bring i strong Pokemon
floor 30 of solar cave
Medicham is on f20
wish cave 99 floor lvl 40
Celebii is not in Wish cave, but Jirachi is. Jirachi is located at the 99th floor.
In any floor i found it on floor 2
The last floor is floor 20. PS: The HM Surf is on it.
Mewtwo is on the 99th floor of western cave