Dont be one of those people who make shiny max iv mons, people will see youre faking.
What you do is, breed a few eggs of the mon you want, take one of those and edit it in pkhex to be shiny with good stats, max its evs out but dont make it flawless. Hatch it, take a pic, and squirrel it away for proof incase friends call you out.
This is the only proper way, plus you raise the pokemon and keep the soul of the game intact