You can not buy the thunder stone. Sorry. The way you can find it though, is by mining.
I have several Thunder Stones in Pokemon Platinum. In Platinum, Diamond, and Pearl, you can find them frequently by digging them up in the Underground.
the Pokemon are pikachu and evee to jolteon and that is all
Go underground and start diging
You can get the thunder stone by going underground and digging for it in Pokemon diamond/pearl ( the thunder stone , fire stone, water stone, and the leaf stone is very rare, so good luck!).
Thunder stone =Jolteon Water stone = Vaporeon.Fire stone = Flareon.
the Pokemon that evolve with the help of a thunder stone are : pikachu +thunder stone = raichu, or eevee + thunder stone = jolteon.
train it to a higher level or use a thunder stone. :)
if u have an eevee use a thunder stone to evolve it into a jolteon
underground dig for it me myself has 14 thunderstones
In Diamond, Pearl, and Platinum you can find a thunder stone underground.
well you can evolve eevee with a thunder stone,a water stone,a fire stone hope i helped
thunder Pokemon if it has evolutions
You can find the thunder stone in New Mauville
you can find a thunder stone by checking the UNDERGROUND
The level of your pikachu doesn't matter, because to make it evolve you use a thunder stone on it. i hope that answers your question. You can get a thunder stone underground.
It is in Sunnyshore City near the lighthouse.
You can get a Fire stone,a Water stone and a Thunder stone in one of the rocks.You can also find those in Diamond and Pearl.
There are only two Pokemon(without the National Pokedex).They are Pickachu (into Raichu) and Eevee (into Jolteon).
Pickachu and eeve can evolve with the thunder stone
You can't, it needs a Thunder Stone.
I only know that Pikachu evolves into Richu when a thunder stone is used