How do you get a Shiny Rotom?

There are a few ways to get a shiny Rotom is by breeding. You could use the Masuda method by using parent Pokemon from a different country. This works because it quadruples the chance of hatching a shiny from an egg. Or you could possibly RNG a shiny Rotom. Full steps for RNGing shiny Pokemon can be found at the link in related links. But you do need to know your secret ID and you have to download a virus-checked program called RNG Reporter. RNGing is the most efficient way of getting shiny Pokemon, and can also be used to get "flawless" Pokemon with the exact nature and IVs you need.