So /vp/, here's a thing i never understood.

How does shiny finding works?
I heard you get a precise iv value that is random for every game copy that determine if your mon is shiny, but if so, how come MMing and chain fishing let you have different iv spreads for your shinies?

Pic related will be my first and maybe last MMed mon, i alr have in the day care an esaperfect, adamant hawlucha, breeding with an esaperfect japanese ditto