try Surfing around a beach, if you cant do that hope that fishing gets you one, though i doubt that will happen.
it evolves into crawdaunt
use a fishing rod at the bottom of petalburg town! at the pond at the bottom
Depending on where you use it you can find various pokemon like Carvanha, Corphish, Sharpedo, Feebas, Staryu.
Lvl 30
Fish for them on Routes 102 and 117 or in Petalburg City
Get a corphish and level it up to level 20 or so and it will become crawdaunt.
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Corphish is a Water type pokemon.
corphish is a Pokemon that is native to the hoenn region
The safari zone after national dex
You go to Celestic Town, Register your Super Rod and fish. You can catch the Corphish with a Rarity of 30%.
There is no Pokemon mansion in sapphire.