There really isn't a specific underground section to get sun stones. You just have to be lucky to find them. Sorry if this doesn't help much.
Cottonee does not evolve into Whimsicott at a particular level. You must use a Sun Stone on Cottonee to make it evolve.
At the Space centre in Mossdeep City.
Go to Ruin Valley on 6 Island - When you get to the grassy portion, head south. Push the rocks near the southern bend to get the Sun Stone. :shadow66648
If you have a Pokemon that interacts with the Sun Stone, such as Vulpix or Sunkern, you can use the Sun Stone on them, and they will evolve.
In Pokémon Liquid Crystal, the Sun Stone can be found in the Ruins of Alph. To obtain it, you need to solve the puzzle in the Ruins of Alph by pushing the correct boulders into the proper slots. Once you solve the puzzle, a secret chamber will open up, and you can find the Sun Stone inside. It is a rare item used to evolve certain Pokémon, such as Gloom and Sunkern, when exposed to it.
no. the sun stone was introduced in Pokemon gold and silver.
on the fountain
I forgot about the dusk stone,but I think u need to go underground to find the sun stone.
You can find a Sun Stone in Raimon/Nimbasa City (The 4th Gym City) The Sun Stone can be obtained from a person in the apartment left of the Battle Subway on the 2nd floor.
You find sun stone underground!
underground of Sinnoh
underground
The sun stone is given to you by a guy in the mossdeep city space center he will be sitting near the entrance.
you go to the undergorund and find it
go to the space station and talk to the sailor dude and he will give you a sun stone or find a solrock that has one
I believe you can find it for sale in the department store
find a sun stone.