The more I think about it, the more exciting this direct seems. I'm ready for my hopes to be crushed in the future.
The potential for this to be an attempt at replacing Showdown, if it's actually a good attempt, is so enticing. I love showdown, but obviously it doesn't have the budget of an official game. If Champions let's players just make whatever pokemon they want (and restrict them to Champions of course), and if they add the historical element of Showdown, allowing players to replicate old gen mechanics, typings, and stats, I can't even imagine how amazing that would be.
But it would also let Pokemon do something I really want them to do, which is to make the mainline games have a more active battle system. Whatever the battle system in ZA is, I'm sure it will be too simple for me. If you can't hold items or have EV and IVs, I'm not interested in it long term. But if ZA is just testing the mechanic for Gen 10 where the battle mechanics are fully fleshed out, the prospect of real time battles having a competitive metagame along side the turn based one is sooooooo enticing to me. I don't want the turn based battles to ever go away, but having a battle simulator game along side a real time battle game, if they're both good, sounds like a dream.
It also reminds me of how Pokemon Adventures conveys battles. Where the battles are real time, but the pokedex shows the pokemon's health and stuff on the screen as the battles in the games they represent. That's cool.
EDIT: Oh and can we PLEASE move on from the rotom phone, already???? It's been 3 generations. I haaaaaaate that thing.