What do I use fire, thunder, leaf stone on?

Fire Stone >> Eevee to Flareon, Things like that.
Thunder Stone >> Eevee to Jolteon, Pikachu to Raichu, stuff like that.
Water Stone >> Eevee to Vaporeon, things like that.
Leaf Stone >> Gloom to Bellossom

You use the stones on the type of Pokemon that the stones are equvilent to. Like a fire stone should be used on a fire type Pokemon. But the stones don't work on every pokmon, only some. Example: A fire stone works on Growlithe but not on a Charmander.

Fire Stone: Vulpix, Growlithe, Eevee
Thunder Stone: Pikachu, Eevee
Leaf Stone: Weepinbell, Gloom
Water Stone: Eevee


That's all I can think of

Ya you need to find shards around the world trade it left of steves house yellow shard = thunder stone and so on

Water stone can be used on that Pokemon with a big leaf on it's head

Use fire stones on---- Vulpixes
Use water stones on--- Staryus, Lombres
Use thunder stones on- Pikachus
Use leaf stones on---- Glooms
Use sun stones on----- Glooms
Use moon stones on---- Jigglypuffs, Skitties

Thre are more Pokemon that use stones but they are unobtainable on the game.

Use fire stones on---- Vulpixes
Use water stones on--- Staryus, Lombres
Use thunder stones on- Pikachus
Use leaf stones on---- Glooms
Use sun stones on----- Glooms
Use moon stones on---- Jigglypuffs, Skitties

Thre are more Pokemon that use stones but they are unobtainable on the game.

Fire Stone: Vulpix > Ninetales; Growlithe > Arcanine; Eevee > Flareon.

Thunder Stone: Pikachu > Raichu; Eevee > Jolteon.

Leaf Stone: Gloom > Vileplume; Weepinbell > Victreebel; Exeggcute > Exeggutor; Nuzleaf > Shiftry.

Water Stone: Poliwhirl > Poliwrath; Shellder > Cloyster; Staryu > Starmie; Eevee > Vaporeon; Lombre > Ludicolo.

You use them on different Pokemon to make them evolve. Here:

Fire:
Growlithe - Arcanine
Eevee - Flareon
Vulpix - Ninetales


Thunder:
Pikachu - Raichu
Eevee - Jolteon

Leaf:
Gloom - Vileplume
Weepinbel - Victreebel
Exeggcute - Exeggutor
Nuzleaf - Shiftry

Water:
Poliwhirl - Poliwrath
Eevee - Vaporeon
Staryu - Starmie
Shellder - Cloyster
Lombre - Ludicolo

There's also other stones: Sun an' Moon.

~SGX

You use Fire, Leaf, Thunder, Water, Sun, and Moon stones to evolve certain pokemon. These Pokemon include:

Eevee (You can use Fire, Thunder and Water on Eevee)
Growlith (Fire)
Vulpix (Fire)
Pikachu (Thunder)
Gloom (Leaf or Sun)
Sunkern (Sun)
Clefairy (Moon)
Jigglypuff (Moon)

And there are many more aswell. There are LOTS of Pokemon who are evolved by stones, so don't throw them out.

You use them to make certain Pokemon evolve