So My Vivillon is the same gender as the Gym Leader's, but different color. Is this because it has different forms? Or because its shiny? I don't recall stars and I don't think my previous Pokemon (Spewpa and Scatterbug) so its probably the former.
Sorry, you're out of luck. Vivllon has different forms based on what country you live in.
Here's a picture of some of the variations: