You can't unless you trade it from diamond
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sneasel can't evolve in emerald cause sneasel's evolution doesn't exist in emerald only pearl or platinum or diamond.
You can't. You have to transfer it from Leaf Green/Fire Red
sneasel can be found in leafgreen at icefall cave on four island, gligar can be found in the johto area of the safari zone in Pokemon emerald.
I don't think you can unless you hack but I'm not positive that it is impossible to catch it.
No, Sneasel cannot evolve in Crystal.