The easiest way is to use the Poke'Radar.
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A golden Margikarp is a shiny margikarp, and as with other shiny Pokemon, there is only a 1/1892 chance of getting a Shiny(golden) magikarp. Breeding a Shiny Gyarados or a Shiny margikarp with another shiny Pokemon THAT CAN BREED WITH GYARADOS/MARGIKARP may have a higher chance of breeding a shiny magikarp. You can also trade the shiny gyarados from Pokemon Gold, Silver, and Crystal version.
With breeding 2 normal Pokemon, the chances of getting a shiny Pokemon are 1 in 8,192. By breeding 2 Pokemon from different countries, the chances of the offspring being shiny is 1 in 2028. With a shiny female Pokemon and breeding, the chances of that Pokemon being shiny is 1 in 64. so, yes, it is possible, but it takes forever.
you might have to turn on and off and keep doing beginning over until your begginer is shiny
No, you don't. Shiny Pokemon appear in Pokemon White version like every other Pokemon game, you can get them through breeding, a legendary could be one, or you could find one in the wild. However, using the Masuda method, which is breeding Pokemon from separate languages, it is more likely to get a shiny then in past games.
You can't. There is no such thing in any legit version of Diamond or Pearl.
no
Breed two shiny pokemon.
To get a shiny Pokemon try using the poke radar
I think a egg with a shiny Pokemon in it is a different color
Yes, shiny pokemon can be breed. However, breeding shiny pokemon does not increase the chances of having shiny offspring, except for in Generation II games.