After completing the lighthouse requests, you receive a golden charm that helps you with the monster fish, so complete the quest first
lake shiny
just keep at it
In lake shiny.
go to the deep blue
yea
blue deeps with a lure
I dont know ! Sorry
go to the old pond
you have to be patient and fight it slow theres no rush with fishing
Spinner
I used a lure to catch bonito fish ( at Blue Deeps)
Cast 30ft. With bait fish.