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.
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The Pokémon that evolve via the Thunderstone are Pikachu which evolves into Raichu and Eevee which evolves into Jolteon.
Poliwhirl → Poliwrath, Shellder → Cloyster, Staryu → Starmie and Eevee → Vaporeon
eevee,
Eevee use stone to evolve
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