Okay, so I've looked online and I haven't really found anything that answers this question, which I found kind of surprising…
Essentially, I have a full team of 6 pokemon, all fully trained through Super Training (i.e. they can't get anymore EV's or 'Base Stats' from Super Training). Does this mean that they no longer acquire EV's from battle and I don't have to worry about my pokemon getting unwanted EV's, or will using the Exp. Share still botch their growth?
TL;DR: I have 6 pokemon fully Super Trained, so can I safely use the Exp. Share without worrying about them getting the wrong EV's in battle?
Best Answer
Once you are fully EV trained (i.e, each pokemon has 512EVs), then it can no longer gain any more Effort Values, so you are safe to kill anything.