There is absolutely nothing stopping them from creating a new Mythical for the 24th movie. The reason for there being no announcement should have more to do with the pandemic as Aura mentioned
I wonder what our next Mythical Pokémon will be?
I've seen some people theorize that because Zarude is a Grass Primate our next Mythicals may be a Fire Lagomorph and a Water Reptile tho that sounds incredibly Farfetch'd in my opinion lol
Why do the writers hate Zekrom so much?Besides, we had a movie about Lugia.
That did not stop them from having a 3-episode arc about Lugia.
We also had a movie about about Reshiram/Zekrom after they showed Zekrom first.
And that did not stop them from screwing Zekrom... Oh wait. I mean. That did not stop them from reusing Reshiram.