Thunder Stone

The Thunder Stone, formatted Thunderstone prior to Generation VI, is a type of Evolution stone introduced in Generation I.
== Effect ==
Can be used to evolve one of several Pokémon. This consumes the Thunder Stone.
* Causes Pikachu to evolve into Raichu (outside of Alola) or Alolan Raichu (in Alola)
** The Thunder Stone cannot be used to evolve Cosplay Pikachu, Pikachu in a cap, the Partner Pikachu, or Pikachu with the Gigantamax Factor into Raichu.
* Causes Magneton to evolve into Magnezone (Generation VIII onward)
* Causes Eevee to evolve into Jolteon
** The Thunder Stone cannot be used to evolve the Partner Eevee or Eevee with the Gigantamax Factor into Jolteon.
* Causes Nosepass to evolve into Probopass
* Causes Eelektrik to evolve into Eelektross
* Causes Charjabug to evolve into Vikavolt (Generation VIII onward)
* Causes Tadbulb to evolve into Bellibolt
== In The Anime ==
The Thunder Stone debuted in Electric Shock Showdown, when Nurse Joy gave Ash a Thunder Stone so that he could evolve his Pikachu in order to defeat Lt. Surge's Raichu. Pikachu, however, refused the offer. Ash kept the Thunder Stone in case Pikachu ever wanted to evolve; however, in Pika and Goliath!, a similar scenario occurred and Pikachu still refused to evolve. Seeing his determination to not evolve, Team Rocket stole the stone, planning to sell it.
In The Battling Eevee Brothers, the Thunder Stone appeared as part of a collection held by the Eevee brothers. Two of the Eevee brothers offered a Fire Stone and Thunder Stone to Brock and Ash to evolve their respective Vulpix and Pikachu, though both refused.
An image of a Thunder Stone appeared in A Bite to Remember during Brock's explanation on how evolution works.
Ash had to find a Thunder Stone in a scavenger hunt as part of the Wishing Bell Festival contest in Climbing the Tower of Success!. He came across a young man in possession of one who tried to toss it to him from a long distance. The Thunder Stone nearly came in contact with Pikachu but he jumped out of the way just in time, leaving Ash to catch it.
Mystery on a Deserted Island! featured the Thunder Stone along with all of the other Evolution stones available as of Generation V.
A Thunder Stone appeared in To Catch a Pokémon Smuggler! as a part of Clemont's explanation of how evolution works, Pikachu's evolution into Raichu working as an example of stone-induced evolution.
A full set of Evolution stones was seen on display in a stone shop in Geosenge Town in The Cave of Trials!.
Multiple Thunder Stones appeared in Gotta Catch a What?!, where multiple wild Pikachu were digging them up in a valley in order to evolve. One was found by Goh's newly caught Pikachu, who gave it to her Trainer. Later, Goh used the Stone to evolve his Pikachu into Raichu in order to help defeat Team Rocket.
A Thunder Stone was seen in To Train, or Not to Train!, when members of the Eevee Evolution Lab tried to get an Eevee to evolve, only for it to not work.
In Out of Their Elements!, Harmony and Billy attempted to use a Fire Stone and a Thunder Stone, respectively, to evolve their Eevee partners. However, they accidentally dropped the stones onto the wrong Eevee, causing them to evolve into opposite forms than what they had intended. They attempted to correct the mistake with the spare stones they had, but the stones had no effect on the already-evolved Pokémon. At the end of the episode, they gave their spare stones to Chloe.
== Trivia ==
* Through a glitch in the Generation I games, Pokémon that would normally require an Evolution stone to evolve can be evolved without it, provided that the Pokémon levels up in the battle and the player has sent out a specific Pokémon in the same battle. In the case of the Thunderstone, this Pokémon is Growlithe.
* In Pokémon Yellow, if the player attempts to use a Thunder Stone on their Pikachu, it'll refuse. Talking to Pikachu afterwards will cause it to shake its head. Traded Pikachu are unaffected by this.
* In Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, if the player tries to give their Partner Pokémon a Thunder Stone, they will not accept it, and therefore, will not evolve. In Eevee's case, the same thing will happen if the player attempts to give them a Fire Stone or a Water Stone.
Category:Minerals
Category:Evolution
Category:Game Mechanic
Category:Electric Element