the best way is to fish in every square (1 step = a square) in the lake next to the weather institute ( were you get that weather Pokemon after saving the scientist from team aqua.) then to evolve it max out its beauty and level it up during the day.
feebass is at mt.cournet.you need a super rod on the way there. sometimes feebass could be there but not all the time.Hope this help =)
You Don't
Jon Saphire's birth name is Jonathan Saphire.
Christopher Saphire's birth name is Christopher Donald Saphire.
good rod
in mt cornet
You can transfer Feebas from the PokeWalker.
you go to route 107 and fish be pashint
Route 119
Chris Saphire is 5' 11".
Christopher Saphire is 5' 10".
in mt.coranet you will need defog use any rod and there are only 4 tiles that contain a feebass hope i helped CORRECTION it must be a super rod or you will not see a feebas