>>32332172>don't even add anything meaningful in-gameOther than making your non-legendary pokemon stronger than adversaries of the same level, or close to?
The difference is damn noticeable when an opposing pokemon probably has a hindering nature or low IVs and yours has 15+ in every stat and a beneficial nature.
Or go with low-IV mons to increase difficulty on yourself if you are a masochist.
0IV-per-stat derps are noticeably harder to use in-game if you aren't autistic.
You only need to breed or catch a handful to get one that isn't rubbish. It's quick and easy if you aren't stupid and unprepared.