Thunder Stone is an item in the “Evolution” category (Items). It costs ₽3000.
In-game descriptions
| Ruby / Sapphire · Emerald | Makes certain species of POKéMON evolve. |
|---|---|
| FireRed / LeafGreen | A peculiar stone that makes certain species of POKéMON evolve. It has a thunderbolt pattern. |
| Diamond / Pearl · Platinum · HeartGold / SoulSilver · Black / White · Black 2 / White 2 | A peculiar stone that makes certain species of Pokémon evolve. It has a thunderbolt pattern. |
| X / Y · Sun / Moon · Ultra Sun / Ultra Moon · Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | A peculiar stone that can make certain species of Pokémon evolve. It has a distinct thunderbolt pattern. |
Where to find it
| Place | Games | How | Tile |
|---|---|---|---|
| Kanto Power Plant | FRLG | on the ground | 45, 4 |
| Kanto Power Plant | FRLG | hidden | 8, 12 |
| New Mauville — Inside | RuSa | on the ground | 39, 4 |
| New Mauville — Inside | E | on the ground | 39, 4 |
Sources : PokeAPI (items, item_flavor_text, machines) · atlas · pokeemerald species_info.h