There is a 1/8192 chance of finding a shiny Pokemon, and since you can't use a PokeRadar in the water, good luck!
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There is no certain place to get a shiny magikarp. You basicaly just look in a place where you would find one and pray that its shiny. This almost never happens
A yellow Magikarp is a "shiny" Magikarp. The odds of finding any Shiny Pokemon is 1 in 8,192. Unless you use an Action Replay code, it will be VERY difficult to find one.
Get a shiny Magikarp. A Red Gyarados is a shiny Gyarados.
It depends on luck. when catching a magikarp, you have a 1/8000 chance of shiny.
There is no way to get a Shiny Magikarp 100% of the time.