You cannot. Skorupi was introduced in Pokemon Diamond and Pearl (and Platinum). It is unavailable in games prior to these. ;)
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You can find Skorupi at the safari zone.
You can find Skorupi in the Safari Zone. its one of the Pokemon of the Day You can also get Skorupi at night time as well as the day. I don't know but skorupi evolves around the level 32 to 40 area. You can find skorupi either on the route to pastoria from veilstone city or in pastorias safari game.
The Great Marsh. Skorupi is one of the pokemon that can bee seen with the binoculars and isn't available every day. See Related Link for details.
you cant get reggiggas in Pokemon emerald
there is no mist stone in Pokemon emerald