They doubled down on nerfing healing moves and rest, lowering their pp, removing roost from a ton of mons, because those shit stall moves that dragged battles forever, yet they left untouched the most busted form of regeneration.
+33% HP, just by switching in, literally an Aguav Berry, except the berry can be used once, costs your item slot, activates at near death HP and requires a stupid nature condition otherwise it confuses you.
Yet Regenerator grants 1/3rd HP, more than a Sitrus berry, just by switch in, with no limits, and it's on the fattest unkillable trash like Alomomola and Slowking.