>>19118754I think what they should add, but is very unlikely, is a built in Nuzlocke. I have no idea how they'll explain it in the game (like why the Pokemon leave) but basically, the moment a Pokemon faints, it is released. Or, sent straight to the PC. The former would be more brutal but harder to explain (you're a bad enough trainer that your Pokemon decided to release itself?) but the latter would be less brutal but a bit easier to explain (your Pokemon can't take any more of the battling so you sent it straight to the PC).
I guess the only issue is you wouldn't want kids accidentally stumbling upon it then complaining about how difficult that'd be.