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This episode hit so many weird notes. On the one hand, it had great things like alt Ash and alt Dawn (Dusk) interacting, Action alt Koharu, and the milestone of Ash's Pikachu actually evolving (devolving) for the first time. It also had great animation during some close-up during battle, and the BDSP chibi reference was great.
On the other hand, it just felt so anti-climatic, and the ending was super rushed. Most everything wasn't explained (no Giovanni, how did they get the tech, what did the Arceus bindings even mean, etc.). I found the past four episodes before these specials to be more entertaining to be honest.