I am not sure but I think it is hidden somewhere
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In Pokemon Crater its an evolution stone used for example Piloswine->Mamoswine. I hope I helped you.
Yes, the everstone.
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! :)
You level it up/you evolution stone.
You can't find it in the wild because its a stone evolution.