doing nothing
corphish is a Pokemon that is native to the hoenn region
You have to evolve Corphish.
You go to Celestic Town, Register your Super Rod and fish. You can catch the Corphish with a Rarity of 30%.
Use the super rod in Celestic Town.
You need the Good Rod.
Corphish can be caught in the Rocky Beach area in the Safari Zone when you place certain objects in that area. Corphish can only be caught by a Super Rod, though.
Corphish is a Water type pokemon.
you can't you can only get it on Pokemon white when there is a special person in white forest you have to surf on the water to get him
you have to use the super rod in celestic town after you get the national pokedex
you can go to petalburg city and use the good rod to catch a corphish :)
Use "Good Rod" on Route 102, 117, and Petalburg City, and you'll get 20% chance to catch Corphish. If you use "Super Rod," it is certain that only Corphish will be caught.
you have to visit sangem town and talk to your rivals sister for updates on Pokemon swarms and corphish is one of those recurring Pokemon.