No, there aren't any whirlpools in Emerald. Its basically useless if you ask me.
You need the move in HG/SS though.
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you dont
You can't have a Pokemon come out of its Pokeball outside of battle.
the first island in emerald is battle frontier
You use whirlpool, a field move HM, to get past whirlpools. You have to defeat a certain gym leader and get a certain badge to use whirlpool in the field (outside of battle).
you can if you have a gameshark