You can't. You have to transfer it from Leaf Green/Fire Red
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I don't think you can unless you hack but I'm not positive that it is impossible to catch it.
sneasel can't evolve in emerald cause sneasel's evolution doesn't exist in emerald only pearl or platinum or diamond.
You can't unless you trade it from diamond
you catch it at night
Yes, You can catch Groudon in Pokemon Emerald.