Go to that route (cant remember which one it is) between Mauville City and Verdanturf Town and go fishing in the pond there. You'll need a Super Rod to get a Corphish.
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Pokemon you can get with the good rod are: TENTACOOL, MARILL, MAGIKARP, CHINCHOU ( under-water ) and CORPHISH.
Routes 102, 117, Petal burg City (Super Rod)
Crawdaunt are not available in the wild. The only way to get one is to evolve a Corphish (starting at level 30).
corphish is a Pokemon that is native to the hoenn region
The safari zone after national dex