oh this is an easy one =O get 2 nd your problem is over =)
To get more than one sun stone you can trade one from another version that gets one to whatever your playing so if your playing ruby and you used the sun stone already you can get another by trading with sapphire and taking its sun stone or emerald too.
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gloom elvolves with sun stone
Get 1st place in the Bug-Catching Contest at National Park, and you will receive a sun-stone. Use it wisely, as it is the only one.
The sun stone is for evolving Pokemon. gloom+sunstone=bellossom sunkern+sun stone=...... I forgot the name.
Gloom and Sunkern. Gloom evolves into either Vileplume (Leaf Stone) or Bellossom (Sun Stone). Sunkern evolves into Sunflora (Sun Stone).
to evolve gloom you need a leaf stone or a sun stone. sun stone=Bellossom leaf stone=Vileplume you can get a sun stone from a person in the space station and a leaf stone on route 119. hope i helped :)