I watched the latest anime episodes. Besides the other two episodes, that being the one with the glaceon girl and a trial, there's sadly no proof of infinite multiverse.
Definitely proof of parallel universes being a big thing.
In general, Team Rocket with futuristic tech use the red chain to force Dialga and Palkia into a 1v1 causing time-space to distort across dimensions. The red chain actually creates an arceus ring around Dialga and Palkia and that mind controls them. Anyways they plan on making all pokemon babies and stealing and brainwashing them. Ashes, Gos, Dawns and Koharus end up thwarting their plans. They can't break the chain cause the pokemon are all eggs, and thus the only thing they can do is pray to Arceus.
The people from the parallel dimensions pray to Arceus and the dude appears for a moment, nukes the chain and disappears.
Everything gets fixed and everyone goes back to their respective universe.