How to change Rotom forms in Pokemon X/Y

Three things:

• The pokemon will be coloured differently. For some pokemon, this can be a drastic change, while others there can be a very mild difference.

• When the pokemon enters battle, a little sparkling animation will occur, along with a unique sound. Blue stars will come out of the pokemon.

• In the pokemon interface, there will be a red star near the markings to indicate that the pokemon is shiny.

There is always a chance that a generated pokemon will be shiny. So yes a 'starter' starter pokemon CAN be shiny with the same 1 in 8192 chance as usual. But if you want a shiny you are MUCH better off trying to get a female and breeding it later. You get the Day-care very soon after the first badge so you are no longer halfway through the game before you can breed a pokemon you want.