If you use a shiny stone on evee what will he evolve in to?

You're thinking of the Shiny Stone, which is used to evolve Eevee into Sylveon.

Here's a breakdown of Eevee's evolutions and how they work:

* Shiny Stone: Evolves Eevee into Sylveon (Fairy type)

* Thunder Stone: Evolves Eevee into Jolteon (Electric type)

* Fire Stone: Evolves Eevee into Flareon (Fire type)

* Water Stone: Evolves Eevee into Vaporeon (Water type)

* Leaf Stone: Evolves Eevee into Leafeon (Grass type)

* Ice Stone: Evolves Eevee into Glaceon (Ice type)

* Moon Stone: Evolves Eevee into Espeon (Psychic type)

* Sun Stone: Evolves Eevee into Umbreon (Dark type)

It's important to note that some of these evolutions also require specific conditions, like raising Eevee's friendship level or evolving it during the day/night.