In the Pokemon series of games, a Lightning Stone, also known as a Thunderstone, is an evolutionary stone that causes a few electric-type Pokemon to evolve. In "Pokemon Pearl," you can find a Thunderstone in Sunyshore City. You can use it to evolve Eevee and Pikachu into their higher evolutionary forms. Players must first encounter every Pokemon native to the Sinnoh region before they are able to obtain these Pokemon.
Instructions
1
Fly to Sunyshore City.
2
Follow the path outside the Pokemon Center onto the elevated roads.
3
Walk behind the large lighthouse. There is a Thunderstone located behind the lighthouse.