Alastor
Pokemon Legends: Arceus is the best Pokemon game in years so far, feels like the closest we've got to a fully 3D Pokemon game on console, as opposed to a souped up version of the handheld games. (And despite the backlash, I liked Sword/Shield so don't @ me)
They took the 'wild areas' from Sword/Shield which were a decent idea with rough execution, and implemented them way better. There's something to be said for the feeling of sneaking through tall grass to stalk an Eevee until you get close enough to throw a Pokeball at it manually. If you have to fight, then it plays pretty much like it always has with a few tweaks, but me initiating a fight and being able to run my character around the battlefield as it happens just feels really good.
I think the coolest thing so far is how you fill the Pokedex. You don't merely catch a Pokemon, you can do other tasks like beat a few in battle, see specific moves from it or even evolve it. So you are not one and done after catching a Pokemon, you can still spend a bit of time running around just looking for the same species to study it, it's a great mechanic.
As has been well documented by now, it's not really Pokemon BOTW, the map is segmented (so far this first part is huge too) but you can 'explore' it to see what Pokemon you stumble upon
Spoiler - click to showI accidentally stumbled into a Level 40 Rapidash that looked evil and tried to kill me
Speaking of which, some of these Pokemon are hostile and you will understand why the dude in Pokemon Snap needed his armoured buggy when you get them after you!
Aside from the wild areas, you have a town hub you can go back to and buy materials for crafting, items, new moves from a trainer, clothes and also sidequests. The story also seems a touch more involved so far, like the tasks I'm given so far are excuses to fill the Pokedex but the premise of your arrival in the world this takes place in is pretty interesting.
I think it deserves its own thread but I will just post my thoughts here for now while I'm talking to myself. It feels like a big deal because whatever here is rough and/or doesn't work could make for a fucking phenomenal sequel.