Hot take that may not fit this thread, but even if I prefer Dialga overall I like Origin Palkia more than the normal one lolPrimal Dialga is a palette swap but still better, fight me
Yeah that's fair, I suppose it could be becoming more like their dimensions in such a way. I just think the concept worked better with Giratina since you can easily see why one form is more fit for the Distorsion World and the other is the more adapted one. LA wasn't that much of a story focused game (which is fine, it wasn't trying to be), I'm just annoyed because it's something that could have been avoided easily if that makes sense.Personally, while I would say that the story never gave me a sense that they were supposed to be a “corruption,” I can see how someone would get that feeling, and it’s not as if I have any clearer of an understanding of why they show up in that form during the climax. The game doesn’t bother with explaining it outright, so my best guess would probably be something-something red sky, something-something space and time bleeding over in excess, something-something making the material dimension more like Dialga and Palkia’s dimensions. But you can easily imagine the climax playing out exactly the same way even if those forms didn’t exist — while they are cool, they exist solely to provide flashy new designs for the boss battle.
I also show the apparently popular idea of them being meant to be the opposite of their signature moves (blocket throat Dialga and no arms Palkia) but that seems unlikely to me given Dialga just uncovers its mouth to use Roar of Time. They are probably just designed as superboss forms like you say.