Ho w do you get a shiny red gyrados in Pokemon pearl?

In emerald any other game you go fish in the ocean. use your super rod and keep killing fish. but ever time you fish in a spot you move. i did this in emerald. where the 8th gym is and i caught a golden magickarp. this evolved into the shiny red gyrados. :)

no you have to have a action replay code for shiny permanent and the Pokemon modifier to get it that is how i got mine