Here's what my reaction would be if I found a Shiny Rayquaza:
Wild Rayquaza appeared!
*sparkling animation; alternet color*
OMFG A SHINY RAYQUAZA (Rayquaza's Shiny forme is my favorite out of all shiny formes of Pokemon I have seen)!!! SCREW SAVING MY MASTER BALL FOR LATIOS!!!
*throws master ball*