BDSP are terrible, there's no denying that, but if you've played it or paid attention, you'll notice that for some reason major trainers have some of the best sets and AI ever used in a mainline Pokemon game, including EVs, which have only ever been given to maingame NPCs in Ultra SM before now. So there's something really weird about Cyrus's Weavile here. Why is it that everyone has a good moveset except his acemon, who's stuck with fucking Fling as its sole STAB?

I used a Weavile myself, and learned that for whatever reason, in SwSh, Weavile learns Night Slash, a 70 BP move only at fucking level 60. Other than slight changes to Dialga and Palkia's learnsets so they can use their signature moves immediately after capture, all other learnsets are complete unchanged from Swsh. Usually in remakes, mons relevant to a region have their learnsets rebalanced, that's why you'll notice different learnsets for lots of Johtomons and Hoennmons between DPPt/HGSS and XY/ORAS. It's clear that someone at ILCA gave a fuck about making the trainers decent, so why didn't they just move Night Slash down to level 40~?

I can only think of one reason, that ILCA weren't allowed to. If they weren't allowed to rebalance learnsets, what else were they barred from doing? It compounds with all the other shit surrounding BDSP:
Why weren't they given the LGPE/Swsh engine and had to do everything in Unity from scratch?
Why were BDSP so rushed that this is the first mainline game to NEED a Day 1 patch? Just when were they told to start making it?

tl;dr I think ILCA tried, or at least wanted to, but a mixture of their own inexperience and TPC fucking them over with a horrible schedule and strict limitations forced them to shit out this instead. If they really wanted to go with the muh faithful remake angle, there's no reason to suddenly give major trainers excellent sets and AI (for a mainline Pokemon). Fucking Masuda as their handler probably wasn't very helpful to them either.