it takes a while depending on what game ex. diamond 20 - 30 tries. an easier way is to get a action replay code and you can make it shiny
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It is completely random unless you cheat or keep on trying to get it as a shiny by continuously checking it out and lightly resetting the game until you get it as a shiny.
Shiny Pokemon weren't invented until Generation II of Pokemon. So there is no shiny Pokemon in Pokemon Yellow!
In the second generation, you had a 50% chance of getting a shiny Pokemon this way, but in the 3rd generation onwards, chances were decreased and you did not have a better chance of getting a shiny Pokemon by using this method. Additionally, you won't know if the baby Pokemon will be shiny until it hatches because eggs containing shiny Pokemon do not look any different from eggs that contain non-shiny Pokemon.
You have a 1/8000 chances to see any shiny Pokemon find an area where you can find Aron alot and wait until its shiny then catch it.
There is no way of telling if a Pokemon in an egg is shiny until it hatches. Sorry.