Chargestone Cave (Japanese: 電気石の洞穴Electric Stone Cave) is a cave within the western half of the Unova region. It is connected to Route 6 at its southern exit, and Mistralton City in the north.
Chargestone Cave has a special magnetic field that causes Magneton and Nosepass to evolve into Magnezone and Probopass, respectively, when leveled up here. This magnetism is also evident by the cave's puzzle: the player must push stone fragments blocking some passages so they are attracted by larger magnetic rocks, making it possible to continue.
After defeating Ghetsis in Black and White, Bronius of the Seven Sages can be found and arrested here. He is guarded by two Team Plasma Grunts that appear after talking to him, and they must be defeated before Bronius can be arrested. He is the only one of the Seven Sages to do this.
Chargestone Cave debuted in The Lonely Deino! during a flashback. It later appeared as a partial setting for Crisis at Chargestone Cave!, where Professor Juniper was doing research. The Joltik and Galvantula that lived there were consuming all of the electricity in the vicinity, even kidnapping Pikachu and Minccino. It was later revealed that Team Rocket was taking rocks from Chargestone Cave, which serves as an energy source for all the Pokémon that live there, and forcing the Joltik and Galvantula out of the cave.
The kanji of its Japanese name, 電気石, refers to tourmaline but the games use the Kun reading (いし ishi) for the representation of 石 in kana as opposed to the On reading (せき seki). This results in the term denkiishi (でんきいし), meaning "electric stone" or "electric rock", and not denkiseki (でんきせき), "tourmaline".