events for legends don't have any story its just "here have this mf we giving them away" and there's nothing interesting aside from a movie that came alongside it
There's an interesting conundrum with the concept of Legendaries in itself these days. Well, it has been a case for quite a while now, but it's starting to become too big to ignore.
Counting Mythicals and alternate forms, the number of legendaries is approaching triple digits. Note that I'm counting "legendary" and "mythical" Pokémon together, because
come on. They're the same thing and always were, availability notwithstanding. But even if you count mythicals separately, there are already 20 of them (not including Phione), and seeing as Zarude is the only one revealed for Gen VIII yet, there probably are another few in store by the time this generation ends. Legendaries are becoming a rather large sub-class of Pokémon. For instance, there are more legendaries in total than there are Ice-types in total. Will all of them be eligible for special treatment in perpetuity? That is, being unable to breed, requiring an event or special occasion to be found, one per region (Ultra Space notwithstanding), all that jazz?
I mean, some legendaries such as Kyogre or Arceus are said to be unique, primal beings, close to gods incarnate. For lore reasons, it makes sense they should be treated as special. But nowadays, TPC is hardly even bothering with backstories for most of their legendaries. Magearna was said to be created by an ancient civilization. But so what? So were Golett and Claydol. Zarude is functionally identical to Rillaboom as far as lore goes (
it's even said to live in packs, goshdarnit!). No lore has ever been presented about Marshadow that would make it any more special than your common Gengar. Zeraora ... exists. Even Lucario is treated as a more special Pokémon than that. Shaymin's Pokédex entries are practically identical to Meganium's. We could go on and on. Beyond being burdened by a few inconvenient mechanics (but blessed with high stats), there isn't much to separate most legendary Pokémon from regular ones.
Something similar goes for the legendary trios. We've seen eight of those trios so far, counting the alternate forms of the Kanto birds and Alola's quartet. Many of them aren't justifying their legendary moniker beyond "they are strong and rare, and revered in one region". They might have some story role or other significance in the games of their introduction (and even then, their interaction with the plot of the game is minimal at best), but it's rarely explained why they have to be unique. Many have been shown to be able to reproduce (Entei in the strangest way possible, because Ho-Oh apparently has a twisted sense of humour). In generations after their introduction, they are shoved in quite randomly if they appear at all.
What's the point of legendary Pokémon? They're meant to stand out, to be special, to be important to lore, to be different from other Pokémon. I mean, it's in the name. They are Pokémon of legends. Except, well ... in practice, they kinda aren't. Even if you think they deserve special treatment, they aren't getting it. Just look at how past-generation legendaries have been made available in games of the recent generations. ORAS had you track down Hoopa rings, which acted as a sort of legendary Pokémon roulette. Interact with ring, some legendary Pokémon spawns. In USUM, you go to Ultra Space locations to encounter Pokémon that may be a random legendary. Event legendaries are just handed to you by random people in Poké Centers. The Crown Tundra will have you go into special Dens to maybe encounter a legendary, and I think we can be pretty certain they don't get their own custom-made encounter locations. It'll probably be "which legendary Pokémon is in the innermost cave this time?" or a variation thereof, because there are dozens of legendaries and not enough dev time to do anything unique for each of them.
It seems like the way to feature past-gen legendaries in Pokémon these days is by way of a mechanic that opens a big Bag O'Legendaries. They're meant to be special, but it doesn't really feel like that when you get to their encounter place and the game basically goes "Here, have a selection of forty-or-so legendaries, have fun sorting them out". At one point you may wonder where the "legend" bit comes into it all. Play the Fun New Minigame to meet one legendary from a set of three dozen, do so repeatedly to catch 'em all. Better write a checklist to ensure you've found all of them, because you're not going to remember them all on your own.
And that's the essence of this ramble, I guess. Legendaries stop feeling special after their time in the limelight, to the point that past-generation legendaries are becoming a bit of an encumbrance to the series. There are too many of them now, their lore is rarely brought up in a meaningful way if it even exists in the first place, and the games don't even bother making them stand out among each other. Their mere inclusion in the game is treated as some sort of reward, but beyond their mere availability, there isn't much importance given to them. Yes, they are stronger than regular Pokémon, but that has the side effect of shoving most regular Pokémon out of competitive viability.
I think it's time to de-legendarize a few dozen old legendaries. Make them postgame-exclusive, make them rare, maybe have only one of each spawn at a time until you beat the Elite Four again, but don't pretend they require a special event, their own separate location, their own minigame, their own lore, or any of that jazz - unless they are actually willing to give them that. No more of this "they are special because they are legendary, but there's a bajillion legendaries so they aren't really special" kind of treatment they're getting these days. Being lumped together in a big roulette pot doesn't make legendaries special, it makes them annoying to obtain. I'd rather have Celebi occasionally make an appearance in Glimwood Tangle than having it appear as one of the Pokémon you may be able to get in a Legendary Raid, or be given it in a Poké Ball from a delivery guy whenever Game Freak feels like doing a promotion. Sure, getting it may be more of a hassle, but at least it would
show that Celebi is supposed to be special, rather than just being labeled as such through its inclusion in a group of designated reward Pokémon.