Evolution Stones
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Evolution stones
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Evolution stones are an important tool in evolving certain Pokémon. All stones cost 15,000 dollars. To use the stone, click on it when out of battle. You'll be given the option to evolve one of the Pokemon in your party. Try to use the stone next to water (while having a Good Rod) because when your character freezes, you may fish for Pokwmon and trigger evolution.
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Moon Stone
Moon stone is in Mt. Moon. Going from the Pewter City entrance, the vendor is hiding in the north-eastern most corner of the first room.
Stone is used by:
- Nidorina --> Nidoqueen
- Nidorino --> Nidoking
- Clefairy --> Clefable
- Jigglypuff --> Wigglytuff
- Skitty (Uncatchable) --> Delcatty


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Water Stone

Cerulean City - Sold by a boy next to the gym.
Stone is used by:
- Poliwhirl --> Poliwrath
- Shellder --> Cloyster
- Staryu --> Starmie
- Eevee (Uncatchable; Evolution Glitched) --> Vaporeon
- Lombre (Uncatchable) --> Ludicolo
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Fire Stone

Celadon City - Sold by the girl by the fountain beneath the massive Department Store.
You can also buy one from the traveling merchant on Route 32 in Johto.
Stone is used by:
- Vulpix --> Ninetales
- Growlithe --> Arcanine
- Eevee (Uncatchable; Evolution Glitched) --> Flareon
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Thunder Stone

Saffron City - Sold by the old man standing near the two gyms. That's the north part of town.
Stone is used by:
- Pikachu --> Raichu
- Eevee (Uncatchable; Possible Evolution?) --> Jolteon
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Leaf Stone

Vermillion City - Sold by the boy near the north-most entrance to the city.
You can also buy one from the traveling merchant on Route 32 in Johto.
Stone is used by:
- Gloom --> Vileplume
- Weepinbell --> Victreebel
- Exeggcute --> Exeggutor
- Nuzleaf --> Shiftry
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Sun Stone

Fuchsia City - Sold by a female NPC hiding in the network of fences surrounding the Safari Zone. From the Gym, she's only a short walk north. There's a break in the fence you can use as a shortcut to reach her.
Stone is used by:
- Gloom (Evolution glitched) --> Bellossom
- Sunkern --> Sunflora
For a More In-Depth article on when to evolve your pokemon and what moves they will learn check out http://grou.ps/pwo/wiki/173750.