So that Naganadel had special telepathy powers which helped it to communicate with Ash and co. and even helped to show to Ash and co. what happened to its world back then via a vision, like just how Latias did in M05 via its Psychic powers. Doesn't logically make much sense but for plot convenience purposes it's OK I guess.
The fight with Dusk Mane Necrozma was a bit too short but TBH I really liked Necrozma showing off its godly power by overwhelming and throwing around Lunala, and even Silvally's attacks even barely fazed it. I'd still say I'd have loved if the action/fight scenes involving Necrozma were a bit longer.
Mega Aggron was an absolute beast!!!!
RIP Kukui's and Faba's Pokemon, that too with just one heavy hit. Really liked seeing one of the really shafted megas back in Gen 6 anime finally getting some much needed love and spotlight here.
Episode ends with everybody together using the Z-power on Necrozma, did quite understand why though....probably to give Necrozma the Ultra Aura it's looking for I guess. And Gladion using a Z-move with Silvally!!!
I remember many people arguing against me that Silvally can never use a Z-move since it already carries items in the memory disks, back during the Aether arc, guess they're proved wrong now!!
Anyway, it was also nice to see that Gladion has got another Z-crystal for himself in Normalium-Z, guess he has done the Melemele trial already.
Quite good episode overall, the excitement was present throughout, and sets up the hype really well for the final episode which is supposed to be the main climax of this arc, though it wasn't faultless at the same time. 8/10.