I know this is a little late but I'm glad we got kalos remakes

Is it ok if I rant about theories I have for this game? (They will likely be a bit long)

Yeah

Theory 1: new legendary
The title of this is Pokémon Z-A, and the only other legendary Pokémon with an A as their first initial (arceus, azelf, articuno) either belong to a trio or was already used in Pokémon legends: Arceus.

Theory 2: new mega legendaries
There are only a few legendary Pokémon that can mega evolve, so maybe while we are getting a new legendary, we will get a new mega evolution for that same legendary, and for those legendary Pokémon that already exist

Hmm interesting

Is it ok if I rant about theories I have for this game? (They will likely be a bit long)

Unova already got its sequel, it doesn’t need a remake.

Yeah that's what I thought