>>29675546OP just fucking turn off the EXP share, it gives you the option for a reason. Turn it off during actual gameplay, turn it on if you feel the need to grind I didn't use it in ORAS and I still had a good time.
Also OP, Archie has more in pokemon than ORAS than he did in RSE, all the same levels + Muk, + the Mega Sharpedo, meaning it is a harder fight o b j e c t i v e l y. Provided it would've been a harder fight if you had the brain cells to turn exp share off.