A few stones can be found elsewhere but majority is underground ( NO TRADE STONES )
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You can only get Snorlax by evolving Munchlax.
Iron Island.
You can get Houndoom in Pokemon Platinum by evolving Houndour. Houndour can be found on Route 214 and Valor Lakefront! Houndour will evolve into Houndoom at level 24.
You can get Ampharos by evolving Flappy which you can get at route 222 (with Pokeradar) but it's uncommon.
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! :)