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
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eevee
It doesn't evolve with a Leaf Stone. To get Leafeon, you have to level it up in a specific area.
A fire stone,water stone,ice stone,dusk stone,leaf stone,thunder stone,and dark stone will evolve him/her.
Contrary to popular belief, eevee does not evolve into leafeon by using the leaf stone. To evolve eevee to leafeon you must level it up by the mossy rock in the Eterna Forest. Other Pokemon that evolve using the leaf stone are: gloom to vileplume, weepinbell to victreebell
you can get the leaf stone, fire stone, and thunder stone at the big department store in celadon city. you get eevee in the back on the Pokemon mansion.