You can find a fire stone at Fuego Ironworks, Stark Mountain (With Dowsing Machine).
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The evolution stones in Diamond/Pearl/Platinum are the water stone, fire stone, thunder stone, moon stone, leaf stone, sun stone, dusk stone, shiny stone, and dawn stone. (Sorry if I missed one) And even though this is the opposite answer, the stone to keep Pokemon from evolving (with or without evolution stones) is the everstone. Hope this helps! :)
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To get a thunder stone, or any type of stone on Pokemon pearl, you need to go underground and look for a bit, I found this the easiest way to get stones.
A total of three Pokemon evolve using the Fire Stone: Vulpix, Eevee, and Growlithe.