Any kind of natural stone,......the man made one's are more porous and can't take the high heat (tend to crack). The less porous the better.
that totally depends on what type of pokemon you like best. if you like grass pokemon use a leaf stone to evolve it into leafeon, if you like fire pokemon use a fire stone to evolve it into a flareon, and so on.
you should get 3 evees and then use the lightning stone on one to get a jolteon and then use the fire stone to get a flareon then use the water stone on the last evee to get a vapreon
if you have a pokemon with strength use the move to push the stone into pit
The average temperature ranges around 500 degrees Fahrenheit though it really depends on the type of fire pit you use and the materials you use to light it.
you can use the fire stone on vulpix,growlithe,evee,and other Pokemon
you can use a fire stone water stone and thunder stone on an evee fire stone is flareon thunder stone is jolteon and water stone is vaporeon
You have to use a fire stone, it will not evolve by just leveling up.
growlithe evolves into arcanine when you use a fire stone on it
You use a fire stone at any level you want.
you can use a fire stone, or you could level him up and hope for the best when he evolves.
Growlithe evolves when you use a Fire Stone on it.
well eevee evolves into flareon if you use a fire stone on it well eevee evolves into flareon if you use a fire stone on it