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Reason: Manga information.
The Magma Stone (Japanese: かざんのおきいし Volcano Stone) is a Key Item introduced in the Generation IV games. It is a red stone formed when boulders melted in intensely hot magma, then hardened. Magma remains sealed inside.
In the games
The Magma Stone is found at Stark Mountain. In Platinum, it is explained that the Magma Stone is able to control Heatran, the Legendary Pokémon that lives within the mountain. In this nature, it is similar to the Red Chain created by Cyrus.
During normal gameplay, the Magma Stone is not available, and BuckDP or CharonPt takes it. In Diamond and Pearl, Buck returns it after receiving advice from his grandfather, while in Platinum, Charon is arrested and Looker absentmindedly picks it up. Buck puts the Stone back.
Once the Magma Stone has been returned, the player is able to battle and catch Heatran.
If hacked into a game cartridge, the Magma Stone will have no in-game effect.
In the manga
In the Pokémon Adventures manga
The Magma Stone appeared in the Platinum chapter, where Buck decided to protect it from Team Galactic by taking it away. However, upon removing the Magma Stone, he also unsealed Heatran, allowing Charon to capture the Lava Dome Pokémon.
In the Pokémon Diamond and Pearl Adventure! manga