You evolve corphish at level 36.
it evolves into crawdaunt
Get a Crawdaunt or for that matter any type of Pokemon that's a crab
Get a corphish and level it up to level 20 or so and it will become crawdaunt.
In Pokemon Sapphire, you can find a Corphish, the pre-evolved form of Crawdaunt which is the Hoenn region's equivalent of Crabby, in various locations such as the Petalburg city water routes, Lilycove city water routes, or Mossdeep city water routes by fishing with a Super Rod. Level it up to level 30 to evolve it into Crawdaunt, the Pokemon similar to Krabby.
http://www.upokecenter.com/dex/?name=CRAWDAUNT
You can't get a crawdaunt egg ,but you can migrate a corpish and evolve it at level 30 or you can just migrate a crawdaunt from another game ,but no matter what you can't catch a crawdaunt or make a crawdaunt egg (you might be able to make a crawdaunt egg with the action replay ,but I'm not sure because i don't have one)
Corphish evolves to Crawdaunt naturaly ay level 30.
The Pokemon Crawdaunt normally learns Guillotine at level 65.
Arcanine is more powerful and popular Pokemon when compared to Crawdaunt. Crawdaunt, being a water and dark type Pokemon, also has more weaknesses than Arcanine.
Crawdaunt is #342 in the national pokedex, and it is a Water-Dark type Pokemon.
Crawdaunt are not available in the wild. The only way to get one is to evolve a Corphish (starting at level 30).
You can fish out a Crawdaunt in the ponds in Celestic Town. It can only be encountered when you use the Super Rod.