In HG/SS, the event Arceus can create a new Dialga, Palkia, or Giratina for you, so it does have the power to create new life. Also, if you go by the Arceus movie, it has existed for a very long period of time, so that could hint at it possibly being immortal. Legendary Pokemon often have more than one story of origin which then adds to the speculation of where exactly it came from.
I wasn't saying that Arceus couldn't/can't create Pokemon, just that him being the first who created everything (Literally God) doesn't seem likely, especially since we're going off of folklore.
As far as having the "god Pokemon" be captured, it is still technically a Pokemon, so it isn't totally impossible to say it can't be captured.
I'm not saying it shouldn't be possible to catch it, just that... well, if you were God, would you become a slave to any human? Even if you WERE caught, you have the power to create Legendary Pokemon at the very least, you'd think you could break the bonds of a pokeball.
But I think that's looking too deep into it. No use in making complete sense out of a fictional video game universe!
I'm sorry, I can't ever bring myself to not think sense. And besides, the only time you can use that argument (No use in making complete sense out of a fictional video game universe!) is when someone is comparing the game world to real world logic. No matter what, everything has to abide by the rules it has governed for itself. I can use fiction logic to make sense of the fiction universe, because if I couldn't then it'd at best be a flawed story. Sure, I'm assuming the story should make sense, but I don't think you can really penalize me for that.
This is the logic I'm abiding by to come to the conclusion that it MAY be POSSIBLE that Legendaries evolve or have previous forms, if you wanted to know:
ONE: Pokemon evolve.
TWO: Knowledge of Pokemon is ever expanding, frequently providing new evolutions to old Pokemon.
THREE: Pokemon often have unusual evolution requisites that aren't found for years.
FOUR: The more a Pokemon is studied, the more is discovered about it.
FIVE: Most Pokemon evolve at some point, somewhere.
SIX: Legendary Pokemon aren't very well known, and most people have never seen them.
SEVEN: Because they aren't well known, people tend to make folklore about them.
Just because you capture Dialga, doesn't mean that time stops. Some Pokemon seem to serve as guardians, but many don't. Again, you might be trying to make logical sense out of a video game.
Dialga can manipulate time, and I may be wrong cause I haven't seen the movies, but I don't think he's the embodiment of time. Meaning, he is not the physical manifestation of time that keeps it moving. I think he can stop time, move it forward or backwards, and some other stuff, but taking him out wouldn't make time stop. Again, there's logic to everything. Mine may be wrong, but that doesn't mean this game doesn't abide by logic of some sort.
Some Legendary Pokemon are considered one of a kind only. (Mewtwo, Arceus, Dialga, Palkia, Giratina...) But with other Legends, like Celebi, more than 1 exists. This calls into the mystery of some of the Pokemon being deities or gods. In the anime, there were 3 separate Lugia: the mother and baby, and the one from the movie. Also, it would seem to make sense that there should only be 1 Giratina the lives in the Distortion World, however you can create a new one in HG/SS.
I don't understand. Why does only one of a legendary mean that they are a God? Also, with Legendaries that have more than one of them, that means they are just ridiculously strong normal Pokemon, right? So, for them, evolving or having prevolutions doesn't seem so farfetch'd to me even if you disagree with most else I've said.
I think it helps to view each individual game as an alternate universe. (This would be the best way to see Pokemon, since there should only be 1 Mewtwo, yet you can obviously battle other trainers through wi-fi that also have a Mewtwo.)
I view all of wi-fi as one big alternate universe room. How else would tens of thousands of the same person meet up. None of that is real, or canon to anything ever. It's too much to say that every game is it's own continuity though.
It has been suggested in the games that Legendary Pokemon exist without a need for evolving. One of the Profs. mentions that, but I can't remember which one. I think this could also link back to the possibility of them being considered gods by the people in that world.
Professors also at one point said Pikachu was the first in it's evolutionary line. And that Scyther doesn't evolve, and that Evees only evolve into three separate Pokemon. Like I said before, their knowledge is constantly growing, which is why they tend to say such in the beginning of the games. They say things like Pokemon are mysterious, or they're researching them, or whatever. If the Professors knew everything about the Pokemon already, then they wouldn't call themselves researchers. They'd call themselves... Scribes, or Librarians. Something that has nothing to do with finding NEW things.
But to answer your question, I don't think any ordinary Pokemon could have evolved into a Legendary. You compared Fearow to the 3 birds, but I don't think that would make much sense.
I compared Fearow because I was trying to have fun. This was intended to be a fun little game about baseless speculation, where all the little Pokeboys and Pokegirls could take a load off to compare Pokemon for no reason other than to relieve some boredom. I was kinda serious about the Mew one, though.
You're taking the games too literally. What's the point of a game if you can't even complete it? That's mocking players, so of course Arceus has to be available. If it wasn't, there'd be some petition to get an event going or something along the lines of a boycott. Not that extreme, but you get the point.
Alright, I'll give you that, but only for event Pokemon. But what about when they literally throw the Pokemon in your face, and you either have to capture or kill it (Well, not literally kill)?
If you want a better source where people respect the powers of the legendary Pokemon, look at the anime. Or even the manga. Those are the sources where you'll see the logic of not being able to catch certain Pokemon. The anime has many episodes dedicated to some evil team wanting to catch a corresponding legendary. There was the Power of One movie where catching the three birds would have completely screwed up the balance of the world. Catching them would have made a drastic effect on the environment or their territory, whatever.
I'm sorry, could you speak up? I couldn't hear you over my Icee.
You mention anime legendaries caught. However, you didn't notice that the legendaries caught aren't the ones destined to control the world, or something along those lines. For example, no one caught a Giratina. There's the problem of actually getting to it since it rules the reverse world, and the fact that it's big and you probably won't even dent it. There was the Darkrai and Latios that Tobias used, and that almost makes sense. Except, why had had them in the first place, but that's a different discussion. Darkrai isn't some major entity that can devastate the world because it got captured. Its powers are strong, sure, but it's not destroy-the-world powerful.
Alright, let's exclude Arceus, Dialga, Palkia, and Gritana from further discussion. It's obvious they're a different "Tier" of legendary, no one can dispute otherwise. There are still a butt load of others, those are the only ones I'm talking about. So yeah, Lati@s, Darkrai, Mew, Celibi, Pokemon like that.
Raikou did try to save Electric-type Pokemon the short Pokemon series, "Raikou: The Legend of Thunder" or whatever it was called. That's pretty guardian-like, isn't it? Latios sacrificed himself at Alto Mare to save the town from completely submerging under water. That's also rather like a protector. Manaphy had to fulfill the role of being the prince of the sea in the Water Palace and needed to protect all water Pokemon. Rayquaza got in a nasty fight with Deoxys because it thought Deoxys was some kind of threat since it did invade his turf and it also probably thought it did blast Rayquaza back to kingdom come. And come on, it's an alien. Wouldn't you run home and grab a baseball bat to club them flat?
Those are all things that normal Pokemon tend to do. If I had a Charizard, and I was in trouble, and the thing didn't hate every breath I took, it'd probably try to help. Does that mean it was made by a deity for that sole purpose? Answer: no. I didn't mean to imply that they don't protect people, just that they weren't made by Arceus for that explicit purpose. They're just like normal Pokemon, but way stronger.
A few legendary Pokemon aren't guardians though. They're moreover just legends, like a tall tale. Kyogre created the sea, so there's the fact that the sea is already there, so it's not needed anymore. So it just went to sleep or sometimes hopped around and saved Manaphy. Groudon is the same and it rests in eternal slumber and Regigigas is right up in his alley.
The ocean is a REALLY deep place. And the ground goes REALLY far down. for all we know, there could be multiple Kyogre on the ocean floor, and none of them come up unless the water is disturbed. Same for Groudon. It doesn't seem like everything we've seen exists on one land mass, so Who's to say there's aren't a few living in each land mass?
This is relates to what I said earlier: Legendary Pokemon must be available in enough games so that fans are happy they can complete the PokeDex. Wouldn't you be aggravated if you didn't have any of the RSE games, yet you desperately wanted to catch a Kyogre? They made it possible, so there it is. I don't see you point about Ho-Oh and Lugia, since they are pretty much set as only catchable in Johto games. However, there were some events in Gen III so they could be obtainable. This is completely understandable since you can't trade from Gen II to Gen III, so they had to make them available.
I didn't mention Lugia and Ho-oh because I really don't want to mention every legendary every time I type. Like I said earlier, I can understand event Pokemon, everyone wants them so they add events. But if they were going to add an event, then why didn't they put them in the game for everyone to get in the first play-through? Answer 1: Keeps people's interest in the game longer. Answer 2: they aren't supposed to be considered a part of that games canon. In FRLG, the three dogs were part of the story (Post story). That means that there were three dogs before HSSS's, which were meant to be caught. Ohhhh... I'm tired of talking. I'm hungry.
Those two Pokemon are solely examples and can be used interchangeably with any other Pokemon, except of course, a Pokemon from their evolutionary line. Most of the Pokemon you listed were part of a none evolutionary line to begin with, so I suppose that Game Freak wanted to make them stronger so they added an evolution. Let's face it: Tangela was useless, while Electabuzz and Magmar had something going but not the stats to really back them up. But look, you're suggesting that some Pokemon can evolve into legendaries because there could be some new technique or another. Truth is, no legendary Pokemon has been able to evolve and none are part of an evolutionary line. Like I said, not even Phiony evolves into Manaphy. If a Fearow could evolve into a Zapdos, then Zapdos wouldn't be legendary anymore, would it? They'd just be a common Pokemon that anyone can have, meaning everyone else in the games. They'd lose that legendary status as soon as they become common as Spearow.
Fearow has a similarity in its beak, however, its beak is a bit crooked in ways. It also has some tuft or feathers around its neck, which none of the birds have. Except maybe Articuno, but its tuft is more smooth and elegant whereas Fearow's is aggresive along with its design in general. And its neck itself is quite contrasting except Moltres's, since the other birds seem to have their heads stuck on their bodies without one, or follow a smoother style. And fatter.
Actually, it's not the fact that they wouldn't know about its evolutionary line. It's more about how there's only been one seen in the world and people rarely saw it, because it would be called a legendary due to the fact that not many people believe in its existence.
I'm saying that if it exists, it came from somewhere. I posted my logic numerically last post. Ex. If Charizard was found in the wild, and was extremely rare, and no one knew that Charmander could evolve, and Charizard didn't have eggs, Charizard would be a legendary. Now, if it was discovered that only a Charmander who holds this specific item could evolve, it would change our perspectives on said Charizard. Everyone, seeking this Charizard, would search for this item, give it to their Charmander, and Charizard would no longer be Legendary. Does any of that make sense?