Make Sneasel hold the item 'Razor Claw' and level him up at night. He will then evolve into Weavile and will no longer be holding a Razor Claw.
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No, Sneasel cannot evolve in Crystal.
You need a king's rock to evolve sneasel
no
sneasel can't evolve in emerald cause sneasel's evolution doesn't exist in emerald only pearl or platinum or diamond.
Sneasel doesn't evolve by level, in order to evolve it you need to give it a Razor Claw and then level it up at night.