I've noticed that when it comes to discussions on what are the hardest and easiest champion battles, Kukui and Hau rarely get brought up, and when they do, they're sometimes dismissed as being among the easiest... but then you have to remember that SM/USUM not only have the improved Exp Share but also the Affection mechanic, which can make most battles a breeze.

But assuming you're not abusing the Exp Share and aren't using Poké Refresh at all, I think these two are fairly challenging. At the very least, they're far from being the easiest in the series. What's your opinion on this?