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You can run in grass many times, but the chance is very small that you'll get one. Can also use the masuda method. (;
The chance of finding or acquiring a Shiny Pokémon using the Masuda method, it'll increase the chance of finding (or acquiring) a Shiny to 1 out of 2048. this makes the chances 1/4 of the original (1/8192) and in black and white it's 1/6 of the original making it 1/1365.
You would need to patiently fish using the Super Rod to get a Shiny Gyarados, for the chances of a Shiny Pokemon appearing is 1/8192. However, the chances of encountering one can be increased by using the Masuda Method. The Masuda Method is where the two parents in the Day Care are from different countries, so the GTS was required back then. The chances of an Egg containing a shiny is now reduced to 1/1638. This method would require training of the new Shiny Magikarp to evolve into a Shiny Gyarados. An easier way is catching the story-line Shiny Gyarados in Pokemon SoulSilver or HeartGold and trading it to Pokemon Pearl.
Try the Masuda Method. Get Ditto from Japan and breed it with the Eevee. It increases the chances of it being shiny. Alternately, there may be an Action Replay code to do something like this.
The best thing is to get a foreign Ditto to breed with Emboar/tepig to try get the shiny using the masuda method (lowering the odds from 8192 to maybe half that. (It's hard). Alternatively you can get a cheater to hack one for you