If I remember right, there are a few for sale in the mall complex in Celadon city at the cost of 2100 on floor 4
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you can evolve balbasaur to venasaur
The leaf stone will evolve certain species of pokemon
You get a leaf stone underground.
There is no mist stone.
No, you cannot evolve Eevee with a leaf stone. It can evolve into the leaf type Pokemon, Leafeon, but it evolves by leveling it up in Eterna Forest in Pokemon Platinum