Instructions
Travel to the Sinnoh region's Celestic Town, located west of Route 210 and east of Route 211 and Mt. Coronet. Players should first obtain the Super Rod from the Fishing Guru in the Fight Area, which will increase the player's chances of finding Corphish and Crawdaunt. Approach the water in Celestic Town and use the Super Rod.
Continue to use the Super Rod until you encounter either Corphish or Crawdaunt. Players will encounter Corphish in approximately one out of every three wild encounters. Corphish appears between Levels 30 and 40. In one out of approximately 20 encounters, players can expect to battle Crawdaunt. Weaken the Pokemon and use a Pokeball to capture it.
Level up Corphish through battle until it reaches its next level. Ordinarily, Corphish evolves into Crawdaunt when it reaches Level 30. In the wild, players may encounter Corphish at much higher levels. When it levels up, it will automatically start to evolve. Do not press any buttons to allow Corphish to evolve into Crawdaunt.