Elemental Stones are the stones used to evolve certain Pokémobs.
To use a stone, just select it and right click the pokémob.
Fire Stone
The Fire stone can be used to evolve Eevee to Flareon.
Thunder Stone
The Thunder Stone can be used to evolve Pikachu to Raichu , and Eevee to Jolteon and Charzard.
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Water Stone
The Water Stone can be used to evolve Shellder to Cloyster and Eevee to Vaporeon and Squritle.
Leaf Stone
The Leaf Stone can be used to evolve Eevee to Leafeon on Pokécube Generations