Crawdaunt are not available in the wild.
The only way to get one is to evolve a Corphish (starting at level 30).
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you can catch a corpfish and evolve it into a crawdaunt you can catch corpfish with a super rod in the third town on the game where you father is the gym leader. Note: the super rod is in mossdeep city next to the space center. P.S. corpfish evolves at level 30 into crawdaunt.
Swampert is a pretty good choice but if you chose a different starter then other good ones would be Milotic, Walrein, and maybe even Crawdaunt
You can fish out a Crawdaunt in the ponds in Celestic Town. It can only be encountered when you use the Super Rod.
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
You can find it near celestic town in route 210 or 211.