1/8192 is the appearance rate for any shiny pokemon. The odds are no different with legendary pokemon.
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Very rare
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.
Getting a shiny Pokemon is dependent on luck. The chances of encountering a shiny Pokemon is 1/8192, so it may take a long time to get a shiny Abra.
By cheating.
No, the egg will not be shiny. However, it is possible that the egg will hatch into a shiny Pokemon, but the chances of getting a shiny Pokemon from the egg are not any higher than they would be if the ditto were not shiny.