I do understand. That is not the point of me insinuating, you are moving the goal post. You can indeed get a higher boost to two stat points with EVs. Yet there's no way in heck the 10% from it's nature will amount to more than the IV. The IV is also in no way irrelevant. It'll allow you to easier reach break points in your defense and HP. The 31 vs 0 IV is also close to being 50% of maxing EV on the two stats you focus on. Spread out IV's win out in pure stat points. Never did I say that 31 in everything was needed. Rather upper 20's was okay. I just didn't know about the mints, and should have kept the impish shiny Adalass.
It's clear we have different view points and probably different goals in the game. That's okay. There's however, probably little reason to continue this specific topic unless either of us have anything widely important to add. I can attach a save file with good shiny versions of the main pokemons, once I get them. I'll avoid using them and the save file will be at the name change NPC. So you and anyone else can train them how they like.