The second part of the BDSP tie-in with the GOAT Dawn again, it was a pretty interesting episode. A weird one, even. As it turns out, AU Team Rocket used Dialga and Palkia's power using Arceus's Red Chain, to use Palkia's power to open dimensions between worlds and bring Pokemon in from other parts of the AU and the normal Universe, and Dialga's to devolve and revert every Pokemon back into an Egg, so that once they gather them, they re-train them to submit to Team Rocket's will and fulfill their goal of utter world domination. The plan ends up foiled as AU Chloe hacked into what the AU Team Rocket's technology's weakness was, and whatnot. Unfortunately, this led to Dialga and Palkia going berserk and everyone, including Ash, Goh, Dawn, and Chloe and their AU counterparts were shrunk to become super small, and all their Pokemon became Eggs, but gateways to the other parts of the AU and they called out to everyone else and together they reached out to Arceus, who came in as a silhouette and broke the Red Chains. Dialga and Palkia undid all the reversions and devolutions that happened to the people and Pokemon, and sent Ash and co. back to their own universe.
It seems this won't be the last we see of Dawn, which of course makes me happy. If I get to see her more in the future, I'm down for that! There is never enough Dawn.
Interestingly when Dialga's time reversion affected Ash and co., they all were effectively chibi-sized. I am 100% convinced this is an indirect shout-out to BDSP which this two-parter is promoting, and the chibi-appearance of the people in the BDSP overworld.
Also AU Ash seems to be more of a crybaby than Normal Ash, which reminds me a lot of the Mirror World Ash from XY. Mirror World Ash from that series was timid and a crybaby, and while this one doesn't seem as extreme, this AU Ash from this episode also seems to cry a lot. What's with Alternate World Ash Ketchums having a tendency to cry a lot? Also AU Chloe seems to have a Kansai dialect, much like Chloe's doppelganger Haruhi from several episodes ago. That was interesting imo.
Anyway, next up are two episodes surrounding Allister. Seems we'll be getting some Galar rep next, and Gengar will go on a journey to master the ability to Gigantamax. Damn Ash, you've got Mega Lucario, a Pikachu with a Z-Move and the ability to G-Max, and now your Gengar will be able to G-Max as well. This kid's just getting stronger and stronger at this rate.
I imagine she'll appear one final time whenever they advertise Arceus/Hisui region early next year. Dawn meeting her ancestor is probably going to happen in a time travel arc
Ayoooo calling it now Akari will show up for a few episodes in the anime to promote Legends: Arceus and Akari and Dawn will meet let's gooo, and Ash and Goh and Dawn and Chloe will all time travel back to ancient Hisui and meet the Galaxy Expedition Team, including Akari herself, and we'll also meet Cyllene, Kamado, and Laventon and maybe some Hisuian mons too.
It's definitely going to fit the trend for Akari to show up for a few eps considering it's confirmed Akari or Rei (the player character you don't choose) serves as an important NPC in Legends: Arceus the game itself. The three player characters who have been main characters thus far (May, Dawn, and Serena) are all from games that have the player character you don't choose serve an important NPC role, with RSE and XY having Brendan/May and Calem/Serena serve as your rival, while DPP has Lucas/Dawn serve as Rowan's assistant and friend in the game. We also had Lyra show up for a few episodes in DP to promote HGSS, which is also part of the trend as Ethan/Lyra shows up as an important NPC who is your friend in HGSS.
Thus given the trends (which Legends: Arceus' Rei or Akari align with) it's totally possible, if not outright likely, that we'll see Akari in the main anime for a few episodes. Dawn herself will probably show up and as you said, Dawn and Akari will probably meet in a time travel arc to promote Legends: Arceus not to mention Ash, Goh, and Chloe will probably join up with them.
I'd love to see what Dawn's ancestor Akari's character is like, and if Akari and Dawn share any personality traits in common. Dawn is such a fun and awesome character and maybe she and Akari will have an interesting dynamic, even if they don't figure out that Akari is Dawn's ancestor, that is. Of course, nothing's confirmed yet, but I'd be down for it!