You can get a sun stone underground,but its VERY hard to dig one so good luck
Hope this works out.
There are two Pokemon that evolve with a sun stone. Gloom into Bellosom Sunkern into sunflora
Go underground
Gloom can evolve into Bellusme if you give it a Sun stone.
Gloom and Sunkern.
Gloom → Bellossom and Sunkern → Sunflora
gloom to bellossom. and sunkern to sunflora.
You can get a sun stone by digging underground using your Explorers Kit.
Gloom- Bellossom Sunkern- Sunflora
you go to the undergorund and find it
There is no Pokemon found solely in Diamond version that can be evolved with a Sun Stone. Gloom- can be found in Routes 224, 229, and 230. Sunkern- You need the Poke Radar to find this Pokemon in the Northern area of Route 204.
The sunstones causes the following Pokemon to evolve:Gloom → BellossomSunkern → Sunflora
The sun stone was first introduced in the Pokemon Gold and Silver games. This stone evolves Petili, Gloom, and Sunkern.