First go to rusburo, and go to the beach. surf up, (keep to the left) until you get to an island, miss that one and go to the next. there are some trainers and some grass. iff you search long enough, you should find one.
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First you need a Pokemon that knows surf. Then surf all the way up from Rusboro City to an island, not the one where battle girl is located.
you cant get reggiggas in Pokemon emerald
there is no mist stone in Pokemon emerald
You can find a few on route 3.
You can only get it from breeding it from Jigglypuff or Wigglytuff