You can get a sun rock by going underground or after when you have your national dex you need to catch a solrock and solcrock will hold one (5% chance of a solrock holding one)
sun stone
in order to evolve Roselia you have to use a sun stone on it You use a shiny stone, not a sun stone.
underground of Sinnoh
underground
I forgot about the dusk stone,but I think u need to go underground to find the sun stone.
You can evolve Sunkern or Gloom with a sun stone. Gloom to Bellossom. Sunkern to Sunflora.
You find sun stone underground!
you get the national pokedex then find it underground
gloom to bellosom sunkurn to sunflora Sunkern and Gloom are the ones who evolve using a Sun Stone.
to get bellossom in Pokemon pearl, first get a gloom. then use a sun stone on glooom and it will evolve to belossom.
As of Pokémon Pearl, there are only two Pokémon that can evolve with the Sun Stone item, the first Pokémon that can evolve with it is Gloom and it will evolve into Bellossom and the second Pokémon that it will evolve is Sunkern and it will evolve it into Sunflora.
The item sun stone evolves: Gloom - Bellossom Sunkern - Sunflora