The Sun Stone causes Gloom to evolve into Bellossom. It also causes Sunkern to evolve into Sunflora. You can either win it from first place at the Bug Catching contest, or the Pokeathlon dome.
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You have to use the sun stone on sunkern at any level but it is hard to get a sun stone in soul silver.
You can have one by winning the Bug Catching Contest
You'll need to give it a Leaf Stone to evolve it into Vileplume or use a Sun Stone to evolve it into Bellossum.
its a wifi event.
if you have a leaf stone weepinbell will evolve