Here is the evolution list for the Leaf Stone.
Gloom ----> Vileplume
Weepinbell ----> Victreebel
Exeggcute ----> Exeggutor
Nuzleaf ----> Shiftry
He evolves via leaf stone
Weepinbell does not evolve via Level. It evolves by using a Leaf Stone on it.
Pokémon that evolve via the use of the Fire Stone are Vulpix, Growlithe, Eevee and Pansear, the Pokémon that evolve via the use of Water Stone are Poliwhirl, Shellder, Staryu, Eevee, Panpour and Lombre, the Pokémon that evolve via the use of Thunder Stone are Eevee, Eelektrika and Pikachu, the Pokémon that evolve via the use of Leaf Stone are Weepinbell, Gloom, Nuzlaeaf, Pansage and Exeggcute, the Pokémon that evolve via the use of Moon Stone are Nidorina and Nidorina, Clefairy, Skitty, Jigglypuff and Munna.
The Pokémon that evolve via the Thunderstone are Pikachu which evolves into Raichu and Eevee which evolves into Jolteon.
24 Pokémon evolve via the use of a Stone.
Vulpix evolves into Ninetales via a Fire Stone.
Growlithe will evolve if you use a fire stone on it.
It evolves via Fire Stone, not leveling.
There are a few that can evolve via the water stone. Here is a list: Poliwhirl -> Poliwrath Shellder -> Cloyster Staryu -> Starmie Evee -> Vaporeon Lombre -> Ludicolo I would be careful in deciding WHEN to use the stone. In several, if not most, cases, when you evolve via a stone the moveset of a Pokemon changes dramatically.
weepinbell to victreebel (eevee evolves into leafeon via level-up near the mossy rock in eterna forest). Also, gloom, nuzleaf and exeggcute evolve with the leaf stone. Causes Gloom to evolve into Vileplume. Causes Weepinbell to evolve into Victreebel. Causes Exeggcute to evolve into Exeggutor. Causes Nuzleaf to evolve into Shiftry.
eevee into vaporeon poliwhirl into poliwrath staryu into starmie shelder into cloyster
As of Pokemon Diamond/Pearl/Platinum, the Pokemon that evolve via Water Stone are: * Poliwhirl (evolves into Poliwrath) * Shellder (evolves into Cloyster) * Staryu (evolves into Starmie) * Eevee (evolves into Vaporeon) and * Lombre (evolves into Ludicolo)