lets look at all the legendaries then:
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The 3 birds(Articuno, Moltres and Zapdos): Those were supposed to be the masters of those three elements and thats all fine and dandy.
Mew and Mewtwo: These are basically the immortal ones, lets see how long this lasts
I've covered this. All legendary Pokémon are immortal, unless killed in battle. This is what nearly happened to Mewtwo in "Mewtwo Returns".
Lugia and Ho-oh: Now these are okay in my opinion the Johto legendaries were planned or the very least Ho-oh was, If anyone remembers correctly Ash saw Ho-oh in one of the first episodes ever. As for Lugia so far it's stayed original.
Ho-Oh was seen in "Pikachu, I Choose You!" It was the very first anime episode of Pokémon.
The 3 dogs, cats whatever(Suicune, Entei, Raikou): This is when it starts to get repetitive because now these are supposed to be better than the original 3 birds when earlier in the show it was stated that the the birds were the best and no one could defeat them
Um, no. Back then, the legendary birds were considered ubers from the game's point of view. The same goes for this three. Neither set was better or worse. The simply had different jobs.
Celebi: Seems very similar too Mew and Mewtwo but not quite yet and is also rather useless
AH HA HA, no. Celebi's nothing like Mew, except for how you got one back then.
Jirachi: In my opinion one of the most useless legendaries this one was a publicity stunt
Let's not insult one of my favorites here. Jirachi is known as the Wish Pokémon for a reason. It's not a publicity stunt, it's a subtle test for any human who happens to find it. The test is really just a simple question that has no simple answer: "What will you wish for?" It doesn't have a simple answer because your answer will reflect who you are. It really gets you thinking about yourself.
Kyogre and Groudon: Kyogre is the new guardian of the sea apparently so where did Lugia go? Groudon is basically a volcano or earth guardian something like that.
No, no... Kyogre is the ocean CREATOR, and Lugia is the ocean GUARDIAN. They are two different roles. Groudon's the land creator.
Rayquaza: The owner of the sky or space or something similar Original for a short period of time >.>
Not owner; Rayquaza is the Sky Guardian.
Deoxys: DNA Space Pokemon of mystery came to steal Rayquaza's short lived glory.
I've already covered Deoxys. It was just a random new Pokémon. I don't think it came purposefully to this planet, either.
Palkia and Dialga: Dragon Pokemon fabric of reality distorter only god really knows what they are they so far are original well if maybe if you compare them Rayquaza not so much
Actually, they have nothing in common with Rayquaza, except the fact that they're all Dragons. I can also see why Palkia is a Water/Dragon and Dialga is a Steel/Dragon. Space flows freely, ever expanding. Time stays its course, never affected by anything.
Giratina: yeah....no comment I think it's another failure of legendary no reason for it to even exist
If you're going to say, "no comment," leave it at that. Giratina is no failure. We'll find out more from the 11th movie. Until then, you have no right to call it a failure.
Darkrai: only ghost/dark Pokemon to be a legendary and I hope it stays that way Darkrai is a good legendary it's just not very out there
Darkrai, like Umbreon, is a pure Dark-type.
Arceus: Ha! no more Mew and Mewtwo now we have an immortal that apparently created the universe it self...well so much for the big bang theory
Are you kidding? Arceus is the most powerful Pokémon overall, but Mewtwo still hits harder with Special attacks. Also, were you there when Arceus used its 1000 arms to create the universe? Were you there when it created Dialga and Palkia, then Mesprit, Uxie, and Azelf? No. No, you weren't. Therefore, you can't say for sure that Arceus didn't use a Big Bang to do it.
Every other semi legendary or whatever that was made up in the sinnoh gen.: ......FAIL..... really if you think about it all of them are just there to add popularity to the game
Wow, you're a very, very poor judge of stuff like this. A legendary Pokémon will ALWAYS have a purpose to serve, whether you like it or not.
Conclusion: The Pokemon Company has gone over the top to no limits on making these legendaries about the first 6 were okay and they should've just incorporated that into the new games and made a bigger better story also I think Arceus was their biggest mistake at that make an ultimate Pokemon first of all that takes all the fun out of it and if it's so big and powerful there is no point in training it because even mew and mewtwo had defects this is just way to godly
If you think you're so much smarter than the Pokémon Company staff, why don't you ask Pikachu if you can work for them and improve things? Oh, wait, they wouldn't hire you. They're doing just fine on their own.