you need a razor claw, and give it to him/her at night! :)
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No, Sneasel cannot evolve in Crystal.
You need a king's rock to evolve sneasel
it dosen't :(
sneasel can't evolve in emerald cause sneasel's evolution doesn't exist in emerald only pearl or platinum or diamond.
Give Sneasel a Razor Claw and level it up at night. It will then evolve into Weaville.