I feel like some people are really missing the point with this game. It's designed to be a super casual introductory level Pokemon game for next-generation fans, it' not meant for us veterans. Id be surprised if there was any amount if competitiveness to it other than basic battling, so I wouldnt expect EV training to even really be a thing, but maybe it could, who knows. I essentially think of it as "Pokemon Go 2". The point is, don't judge it like you would a main series game, because that's not at all what it is. That title will be coming out next year.
They will likely make it to where there will be integration with the new core games/Pokebank, so that if people want to play it competitively with stats/natures/IVs/EVs, they can.
I know when I get it im just going to sit down and enjoy it and not worry about the chores of competitive training.
Edit: whoops I initially typed this with my phone and the font size was giant for some reason. Fixed....