(Sorry for the double post)
So I've started to clear out all the Battle Challenges and the game is starting to get aggravating. It doesn't help that the translation for many of the items on the list are questionable (power combo vs combo vs arte combo, what the heck 'don't get hit' means for the dodge one, etc.) and some are outright wrong, like "You've performed skills that interfere with enemy's attempt to backstep".
What's downright awful, though, is that for the most difficult ones, the game really doesn't give you enough feedback as to what's going wrong with your meticulously planned link combinations.
I just spent the past two hours attempting to troubleshoot what was going wrong with my Dual Chain x9 attempts (basically use all 9 elements for the weakness multiplier, the catch being all 9 have to come from linked artes). I honest-to-God made four different attempts at sets of Artes
from scratch that I was 100% sure covered all 9 elements, yet the after succesfully pulling them off, dumb timing and all, Dual Chain 9 didn't register (While Dual Chain 6 did, implying a few elements didn't register). Up till this point I have no idea if it was simply some attacks not connecting, or if the AI was attacking the mobs with non-linked-arte attacks making those elements permanently not register in my chain, or whatever. After a few successfully executed (or so I thought) attempts on each set, I basically stormed off, forced myself to cool down, come back, and cook up another array of Linked Artes without even knowing what was wrong in the first place.
It finally worked with a really, REALLY obtuse combo with Ludger linking with all 3 party members AND switching between hammer/swords/guns. The timing on those switches were downright ridiculous since you both needed to keep your link chain going, as well as the power chain, and I honestly didn't expect it to register, but somehow it did, after two hours of trial and error.
edit: Keep in mind this needed to be attempted with a full Overlimit bar, meaning back to title and loading a game every failed attempt. God.
edit2: With this comes the morbid reminder that one day I will be too old and torpid to platinum games anymore.
tl;dr never been so annoyed at myself going after JRPG platinums.