You must give it the item Razor Claw and level it up at night time. You can get one in the Pokéathalon dome or sometimes wild sneasels will be holding one. I advise battling wild sneasels and using the move theif to get any held items.
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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.