This looks... pretty promising, I must say.
I am especially happy with how many "alternate animes" we got this gen. Poketoons, Twilight Wings, the GOTCHA video (if it counts) and now this. I hope the trend continues and we will be getting more of these in the future. Especially that 2022 will mark the 25th anniversary of Pokemon Special vol. 1 release in Japan. I am really hoping for a commemorative OVA or miniseries based on the manga. This seemed like a total pipe dream a few years ago, but now I think it has advanced from "totally impossible" to "unlikely but not impossible".
But going back to Evolutions. Since the episodes are fewer in number than Generations, I would at least hope that they are longer than five minutes, though this might be a pipe dream.
The Johto one looks especially promising to me, but perhaps that's just my bias for everything Johto-related. But the choice of Kimono Girls as the protagonist is curious. At first I thought it'd retell the Lugia climax from SoulSilver, but one of the concept arts shows the Kimono Girl performing in front of the crowd (and the episode's title "The Show" suggests that as well), so it may not be what it seems to be. The Kanto one is interesting in the aspect that it seems to be based on the LGPE version of the story and uses LGPE Green as the protagonist. It seems to take place in Unknown Dungeon, if I'm identifying one of the concept arts right. I just hope that it won't be just about Green throwing PokeBalls at Mewtwo. The Hoenn one may be interesting too if it provides some backstory about Zinnia, Aster and the Draconids.
One fear I have that some of the episodes may overlap with Generations, retelling more or less the same stories. I'm especially afraid about the Unova one (looks like a retelling of the Pokemon League Plasma climax to me, but it's too early to say for sure...), the Kalos one also looks suspicious. The first episode that comes next week should tell us what to expect more or less, although it's the later episodes that look the most interesting to me. The Galar episode looks pretty straightforward and predictable as to what it's gonna be.
I'm waiting and I hope for more game-based (or manga-based, or even self-based like Poketoons) animations alternate to the "Ashnime" in the future. This is something that we never get enough of.