I recently doubledipped on SA version of HGSS vol 2 and the first few volumes of BW arc just to have a complete set of English translated volumes with the proper numbering from 1-61
This made me re-read the HGSS arc again and it saddens me to know we are never getting PLA arc. It's such a missed opportunity, especially considering it's designed like a mainline game, contributes to the main worldbuilding like the mainline entries and offer crucial lores and new mons/formes.
It's actually never quite explained why Arceus was sad when it showed up before the Johto cast and TR executives. His sudden appearance was also never explained and I find it funny how Gold made remarks about how Arceus probably came fully under its own accord (and not bc he was truly being controlled by some lame TR goons or anything) and seemingly only wanted to witness Togebo's growth along with his relationship with Gold. If PLA arc existed, the authors could easily connect the dots by showing us Volo & Togepi (they are even THE Volo sync pair in Masters EX!). Maybe the way Volo treated Togepi in that arc and everything he did to conquer Arceus was always the reason Arceus had to show up centuries later in Johto for Gold & Togepi. PLA would also be the perfect time to further explore the reasons for the animosity the 2 DP dragons have against Giratina. Sure, they were sorta touched up in HGSS but it felt very tongue-in-cheek and did not tell us anything beyond the generic lore of this trio which we always know from promotional materials. Kusaka is a god of connecting the dots (only second to Oda imo) and PLA arc would have been so perfect.
Cyllene coincidentally looks quite like Sird too. Kusaka could even spin this to make it such that both Sird and Cyrus are her descendants and the former somehow traveled back in time to cause more unwanted paradox, so Dia, Pal and Platinum had to be summoned to the past to stop her. Somehow something happened during their travel and the 3 got separated or something, with Platinum losing her memories and arriving in a much distant past, becoming "Akari" who came to think she always belonged in Hisui and Dia had to make her remember and bring her back to the present time. Or, just anything to tie up all the Sird loose ends, really. For a very climactic ending, Kusaka could even kill off the 3 DPPt dragons during their final fight in the arc, to explain why Arceus had to recreate them again from scratch in HGSS arc and maybe stripped off Dialga and Palkia's abilities to transform to their Origin Formes so as to not cause the same problems.
Thoughts? I just want a PLA arc dammit... (and LGPE too. And Rainbow Rocket. Sigh)