There's three other points to make with it:People have complained and will continue to complain about ever-mounting powercreep but I legitimately think that pre-nerf Crowned Zacian will not be surpassed as the most disgustingly optimized Pokemon ever for a very, VERY long time. The only good thing that can be said for it is "It's not RBY Mewtwo". Other than that... Well, let me put it like this.
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Genuine question: How do you make a Pokemon stronger than this under the current design ethoses of the series without delving into hackmons-level nonsense? How do you even begin to surpass the undisputed best typing in the game with more power and bulk than Mega Mawile and a speed tier only a few points behind Pheromosa? Koraidon and Miraidon are already noticeable steps down: They're still super strong, yes, but all their STABs have immunities and their baseline offenses aren't anything special for mascot legendary standards. In other words, they have actual meaningful flaws, something which doesn't apply to Zacian-C!
This Pokemon being amazing isn't unpopular, I know, that's not my argument. What I am saying is that this is almost certainly the end of the line for powercreep unless there's some major fundamental change to Pokemon design such as a rebalance of the type chart or Game Freak introducing Pokemon with BSTs in the 800s and 900s.
It could not use an item.
It could not DMax.
It's ability was stupid-broken as well.
Which is a good example of how restrictions on a mon really don't matter much unless they're overbearing. No item and no DMax(a legit busted mechanic) would normally be a big deal, but between a BST of Yes and an ability that's better than any item, Zacian managed to be completely busted anyway. And I think GF learned from that(given just how strong the nerf-bat was) and won't be relying on restrictions to balance mons going forward.