You can get them many ways, such as mining, or simply running around sinnoh and finding them.
You can get one in sunyshore or u can dig for one underground
The Underground or Sunyshore City
I'm not exactly sure ,but i think you have to go underground and dug it up.
You can't find it; it's not like that. If you got the Eevee from Bebe, use a Thunderstone on it and it evolves.
You can get one in sunnyshore city or underGround
Pokemon 135 is a Jolteon you must get and evee and put a thunderstone on it!
pikachu evolves into raichu if you use a thunderstone on him other Pokemon evolves to if you use it but i don't now them DIAMOND AND PEARL ONLY
A Thunderstone can evovle Pickachu.
one place is in the underground
In sunnyshore city in front of the lighthouse there is one on the ground
You use a thunderstone. I did Riachu is amazing!
no, you can only get them from using the explorer kit or sunnyshore