i read that in red,blue,yellow,gol,silver and crystal all shiny pokemon have the same IVs (of ten) exept their HP i think. But in all the following games their IVs are as random as any other pokemon. Base stats never change for a species as far as im aware.
I'm up to 3300 battles so im nearly halfway... a brand spanking new shiny glossy glimmering gleaming dragonite will soon be minemwahah