They continue to use regular Pokemon as well as legendaries.
THE LUCENT NARGA IS DEFEATED!! Cheese for everyone!
Nearly killed it on the warm-up, closed it out on the second attempt. Got two Cloudy Moonshards for all my struggles, meaning I'll either never need to deal with that super-Lucent Narga ever again, or it won't be for a very long time (and I'll have proper equipment by then, no doubt). Funny how I got two Moonshards 'fore I managed to get even a single Narga Mantle. The worst is truly outta the way. Now I just need t' grab said Mantles from that one quest and a few more Lucent Narga carves from the normal difficulty Lucent... which isn't actually unlocked 'til my Hunter Rank is 3 higher. Even after this success, my epic Longsword still has t' wait to be forged. ._.
On that note, I'm stayin' the hell away from event quests 'til my equipment is indeed top tier.
It's similar to the Sashpedo I use, only Sharpedo gets Destiny Bond, making the second kill almost guaranteed. The Battle Maison AI seems to always attack if your Pokemon is in the red zone. If they have a priority move, they'll use it, something I can scout easily with Protect. It has issues with bulky Pokemon, but that's why Sableye's there. MegaPinsir is the sheer firepower, as it can blast through so much. Probably something that would fit better than Mega Pinsir or maybe Sableye, but it's sufficient.
Sadly, I did lose the 90th battle. Damn.