After a dozen or so tries against the E4, countless losses beforehand that made me pretty poor (to the point where I used the few wins against E4 members to farm money to buy Full Restores and Revives), I finally cleared Umbra Moon. With that, I am just about done using wilds for playthroughs, I now want to keep breeding a team for them. I'll do so for Nova Sun. It was really annoying, but the good kind because if it was the bad type, I would've quit playing or just use some OHKO cheat. I even considered using Gold Bottle Caps as my mons were already at 100 by the time I made it to the E4 (all but starter Decidueye had Lucky Eggs, so that particular mon was behind by less than 10 levels, but after E4 tries, it made it to 100). I want to see if the challenge is still there with perfectly bred competitive mons instead of wilds. I could've SOS chained but the Adrenaline Orb didn't become available to buy until pretty much halfway through the game, and without those, chaining is a nightmare. My starter was RNG'ed, lazily to 4IV Brave, with non-perfect stats in SpA and Spe, it held a Quick Claw for the whole game, as in since it's received at the school.
I'll also give the Gen 6 ROMhacks a try, pretty fun overall.