However many there are in Diamond, Pearl, and Platinum. There's no difference in the way evolution works.
For an exact number, there are seven; eight if you count the Oval Stone.
The list: Dawn, Thunder, Moon, Water, Shiny, Leaf, Sun, and Oval (if you count it).
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Many people give you stones when you call them. OR you can go to the bug-catching contest and win first. hope this helps
There are many different Pokemon that needs stones to evolve for example Pikachu: ThunderstoneEevee:Thunderstone Firestone WaterstoneMurkrow: DuskstoneChansey: MoonstoneENJOY Hope it helpedBy Pokemon Fan A
I think you get when you own 250 Pokemon but I'm not sure because I can't get the Pokemon through the GTS I need to get that many.
No one counts Pokemon like that.