How do you get captain crow in dragon quest monsters joker

Check the Piracy Problems in the scout's den to find out where he is. To find him, jetty between the to islands it says he is in between. Also, you can only meet him at night. Every time you beat the monsters he throws at you he fights with stronger ones. Also, on the fourth and fifth encuonter there is only one very strong monster. After you beat him on the fifth encounter he joins you. He is S rank at level 25 when you first get him. To get him again just synthesis him away. That IS correct. But what if there is no Captain Crow? I had to go back and fourth all over again!