Question

Where in Stark Mountain do you find the Magma Stone (in Platinum) after Buck puts it back?

Answer 1

The magma stone is an unobtainable item.
source

Comments

That source just says that it cannot be bought or sold. That's not what I'm trying to do. Buck puts it back in the volcano. Where in the volcano is it? I just want Heatran...

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If you scroll to the top, you can see that the name of the list is "List of unobtainable items"

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Then how do you get Heatran? He's not in that room where the Galactic wannabes were arrested...

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http://bulbapedia.bulbagarden.net/wiki/Appendix:Platinum_walkthrough/Section_25 Hope this helps.