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If Arceus is the creator of the Pokémon world, what are the roles of the other legendary and mythical Pokémon that exist? Do they all have one?

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Whew, that was a tough one to answer, took a while
Their Pokédex entries explain their roles and what they do in detail.

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  • Sub-Legendary Pokémon

Articuno:
A legendary bird Pokémon that is said to appear to doomed people who are lost in icy mountains.

As it flies through the sky, it cools the air, causing snow to fall.

Zapdos:
This legendary bird Pokémon is said to appear when the sky turns dark and lightning showers down.

Moltres:
This legendary bird Pokémon is said to bring early spring to the wintry lands it visits.

Raikou:
Created by Ho-Oh. A Pokémon that races across the land while barking a cry that sounds like crashing thunder. The rain clouds it carries let it fire thunderbolts at will. They say that it descended with lightning. It is an example of Ho-Oh's power.

Entei:
Created by Ho-Oh. Volcanoes erupt when it barks. Unable to restrain its extreme power, it races headlong around the land. It is an example of Ho-Oh's power.

Suicune:
Created by Ho-Oh. Said to be the reincarnation of north winds, it can instantly purify filthy, murky water. It races around the world to purify fouled water. It dashes away with the north wind. It is an example of Ho-Oh's power.

Regirock:
Created by Regigigas. It's body is composed entirely of rocks. A study made the discovery that the rocks were all unearthed from different locations.

Regice:
Created by Regigigas. It's entire body is made of Antarctic ice. After extensive studies, researchers believe the ice was formed during an ice age. The deep-frozen body can’t be melted, even by fire. This Pokémon controls frigid air of minus 328 degrees F.

Registeel:
Created by Regigigas. The metal composing its body is thought to be a curious substance that is not of this earth, it's harder than any kind of metal. It's apparently hollow.

Latias:
It communicates using telepathy. It's body is covered in down that refracts light to make it invisible. It can also change it's appearance.

Latios:
It understands human speech and is highly intelligent. It is a tender Pokémon that dislikes fighting. By folding back it's wings in flight, it can overtake jet planes.

Uxie:
Known as “The Being of Knowledge.” It's emergence gave humans the intelligence to improve their quality of life.

Mesprit:
Known as “The Being of Emotion.” It taught humans the nobility of sorrow, pain, and joy.

Azelf:
When it flew, people gained the determination to do things. It was the birth of willpower. Known as “The Being of Willpower.” It sleeps at the bottom of a lake to keep the world in balance.

Heatran:
It dwells in volcanic caves. It digs in with its cross-shaped feet to crawl on ceilings and walls.

Regigigas:
Created the legendary titans. It towed continents with ropes. Thus shaping the world.

Cresselia:
Those who sleep holding it's feather are assured of joyful dreams. It is said to represent the crescent moon.

Cobalion:
Leads the Swords of Justice. It battles to protect Pokémon.

Terrakion:
This Pokémon came to the defense of Pokémon that had lost their homes in a war among humans.

Virizion:
A legend tells of this Pokémon working together with Cobalion and Terrakion to protect the Pokémon of the Unova region.

Tornadus:
An air deity of the Unova region.

Thundurus:
A thunder deity of the Unova region.

Landorus:
An earth deity of the Unova region.

Type: Null & Silvally:
An attempt at cloning Arceus. It hunts Ultra Beasts.

Tapu Koko:
Deity of Melemele island.

Tapu Lele:
Deity of Akala island.

Tapu Bulu:
Deity of Ula’ula island.

Tapu Fini:
Deity of Poni island.

Ultra Beasts:
Troublesome creatures from space.

Kubfu:
The first form of Urshifu.

Urshifu:
The final form of Kubfu.

Regieleki:
It's entire body is made up of an single organ that generates a massive amount of electrical energy.

Regidrago:
A theory proposes that it's arms were once the head of a dragon. It's said to have the powers of every dragon Pokémon.

G-Articuno:
Its feather-like blades are composed of psychic energy and can shear through thick iron sheets.

G-Zapdos:
One kick from its powerful legs will pulverize a dump truck.

G-Moltres:
This Pokémon's sinister, flame-like aura will consume the spirit of any creature it hits.

  • Legendary Pokémon

Mewtwo:
Clone of Mew.

Lugia:
Commands the legendary birds. It is said to be the guardian of the seas. It quietly spends its time deep at the bottom of the sea because it's powers are too strong.

Ho-Oh:
It will reveal itself before a pure-hearted trainer by shining it's bright rainbow-colored wings.

Kyogre:
Created and controls the waters.

Groudon:
Raised land from the water created by Kyogre, then expanded it.

Rayquaza:
It flies endlessly in the ozone layer. It is said it would descend to the ground if Kyogre and Groudon were to fight, and put an end to their clash. It was the first Pokémon to mega evolve, and protects the Giant Rock, which is said to be the heart of mega evolution.

Dialga:
Spoken of in legend. It is said that time began moving when it was born. It has the power to control and travel through time freely.

Palkia:
It is said that space becomes more stable with it's every breath. It also has the ability to distort space. It's total control over the boundaries of space enable it to transport itself to faraway places or even other dimensions.

Giratina:
It was banished for its violence. It silently gazed upon the old world from the Distortion World.

Reshiram:
It helps those who want to build a world of truth. According to myth, if people ignore truth and let themselves become consumed by greed, it will arrive to burn their kingdoms down.

Zekrom:
It assists those who want to build an ideal world. Mythology tells us that if people lose the righteousness in their hearts, their kingdoms will be razed by it's lightning.

Kyurem:
It waits for a hero to fill in the missing parts of its body with truth or ideals.

Xerneas:
When the horns on its head shine in seven colors, it is said to be sharing everlasting life. It slept for a thousand years in the form of a tree.

Yveltal:
When it's wings and tail feathers spread wide and glow red, it absorbs the life force of living creatures.

Zygarde:
When the Kalos region’s ecosystem falls into disarray, it appears and reveals it's secret power.

Cosmog:
The first form of Solgaleo/Lunala.

Cosmoem:
The second form of Solgaleo/Lunala.

Solgaleo:
Known as the Beast That Devours the Sun. When light radiates from its body, it could almost appear to be the sun. It will dispel any darkness and light up the world.

Lunala:
Known as the Beast That Calls the Moon. It devours light, drawing the moonless dark veil of night over the brightness of day. It then becomes the full moon, showering its own light across the night sky.

Necrozma:
It survives by absorbing light. After a long time spent slumbering underground, impurities accumulated within it, causing its body to darken. It is said that Z-Crystals came from it.

Zacian:
Known as a legendary hero, this Pokémon absorbs metal particles, transforming them into a weapon it uses to battle. It helped put an end to The Darkest Day in the Galar region.

Zamazenta:
In times past, it worked together with a king of the people to save the Galar region during The Darkest Day. It absorbs metal that it then uses in battle.

Eternatus:
It was inside a meteorite that fell 20,000 years ago. There seems to be a connection between this Pokémon and the Dynamax phenomenon.

Calyrex:
Known in legend as a king that once ruled over Galar. It has the power to heal, and to cause hearts to mend and plants to spring forth. It can also see past and future events, with this power, it once saved the creatures of a forest from a meteorite strike.

  • Mythical Pokémon

Mew:
It existed since the beginning. It is said to possess the genetic composition of all Pokémon and has the ability to transform into them. Many believe that all other Pokémon are descendants of this one. There may have been more than one...

Celebi:
It wanders across time leaving clones of itself in those timelines. Grass and trees flourish in the forests in which it has appeared.

Jirachi:
It is said to make any wish come true. It is awake for only seven days out of a thousand years.

Deoxys:
The DNA of a space virus underwent a sudden mutation upon entering the atmosphere from exposure to a laser beam which resulted in Deoxys.

Phione:
It drifts in warm seas. They inflate the flotation sac on their heads and drift languidly on the sea in packs. It always returns to where it was born.

Manaphy:
Born on a cold seafloor, it will swim great distances to return to its birthplace. It has a wondrous power that lets it bond with any kind of Pokémon. It can also swap the souls of living things.

Darkrai:
It can lull people to sleep and make them dream. It is active during nights of the new moon. Folklore has it that on moonless nights, it will make people see horrific nightmares.

Shaymin:
It lives and hides in flower patches. It can dissolve toxins in the air to instantly transform ruined land into a lush field of flowers. The blooming of Gracidea flowers confers the power of flight upon it. Feelings of gratitude are the message it delivers.

Arceus:
Supreme being and overseer of the Pokémon universe. It existed before anything else did. It created the Pokémon universe with it's 1,000 arms, along with the world of Pokémon, and all the legends that keep things in order.

Victini:
It brings victory. It is said that Trainers with it always win, regardless of the type of encounter. It also creates an unlimited supply of energy inside its body, which it shares with those who touch it.

Keldeo:
Cobalion, Terrakion, and Virizion taught this Pokémon how to fight. It dashes across the world, seeking more opportunities to further its training. They say that Keldeo must survive harsh battles and fully develop the horn on its forehead before it's true power will awaken. When it does, the power that lay hidden in it's body now covers its horn, turning it into a sword that can slice through anything.

Meloetta:
It's melodies are sung with a special vocalization method that can control the feelings of those who hear it.

Genesect:
Over 300 million years ago, it was feared as the strongest of hunters. It has been resurrected and modified by Team Plasma.

Diancie:
It can create diamonds by compressing the carbon in the air between its hands. It is the princess of a colony of Carbink.

Hoopa:
It is said to be able to seize anything it desires with its six rings and six huge arms. With its power sealed, it is transformed into a much smaller form. It gathers things it likes and passes them through its loop to teleport them to a secret place. In its true form, it possess a huge amount of power.

Volcanion:
It lets out billows of steam from the arms on its back and disappears into the dense fog. It’s said to live in mountains where humans do not tread.

Magearna:
This artificial Pokémon synchronizes it's consciousness with others to understand their feelings. This faculty makes it useful for taking care of people.

Marshadow:
It slips into the shadows of others and mimics their powers and movements. As it improves, it becomes stronger than those it’s imitating. It was undiscovered for a long time.

Zeraora:
It approaches it's enemies at the speed of lightning, then tears them limb from limb with it's sharp electrified claws.

Meltan:
The first form of Melmetal.

Melmetal:
Revered long ago for its capacity to create iron from nothing, for some reason it has come back to life after 3,000 years.

Zarude:
Once the vines on it's body tear off, they become nutrients in the soil. This helps the plants of the forest grow.

You have reached the end. Congrats.

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edited by
Your comment was the exact thing I was looking for prior to asking my question. Very well organized, detailed, and noticeable. Thanks.
No problem!
3 votes

Mew: Ancestor to all Pokemon

Lugia: Leader of the legendary birds, lives underwater because it is so powerful
Ho-Oh: Creator of the legendary beasts,anyone that sees it is promised eternal happiness
(This could be why ash lives forever, because he is so happy on his Pokémon adventure with his pikachu, and he saw a Ho-Oh in the first episode)
Celebi: Gaurdian of the forest, can travel through time

Kyogre: Ruler of the sea, always battling Groudon
Groudon: Ruler of the land, always fighting Kyogre
Rayquaza: Lives in space and eats meteors, mega evolution was first discovered when man kind met it, stops the fights beetween Kyogre and Groudon

Uxie: Being of Knowledge
Mesprit: Being of Emotion
Azelf: Being of Willpower
Dialga: Controller of Time
Palkia: Controller of Space
Giratina: Banished by Arceus to the distortion world for its violence, basically making it the devil, he is the being of antimatter
Arceus: Creator of all, basically making it god
Regigigas:Creator of the regi trio, towed continents with ropes
Reshiram: Can scorch the world with fire, wants a world of truth
Zekrom: Can scorch the world with lightning, wants a world of ideals

Zygarde: Protector of the ecosystem

Tapu Koko: Protects melemelee island
Tapu Lele: Protects Akala island
Tapu Bulu: Protects Ula-Ula island
Tapu Fini: Protects Poni island
Solgaleo: Radiates light and devours the sun
Lunala: Calls the moon, gets rid of light to make a moonless dark veil

Zacian and Zamazenta: Protect galar, defeated Eternatus to save the day.
Eternatus:Partly made of wishing stars and it’s particles cause Pokemon to dynamax
Calyrex: Ancient Ruler of Galar
The following Pokémon have no particular role (and not exactly in order)

Articuno: Appears to lost people In icy mountains, brings snow by flying
Zapdos: Creates Summer thunderstorms by flying
Moltres: Flapping it’s wings makes a “Dazzling flash of flames”, and it brings spring to wintry places it visits.
(The legendary birds might bring winter, summer, and spring, respectively)
Mewtwo: A genetic clone of mew created by Team Rocket

Kubfu: Given to you by mustard
Urshifu: Has two forms, one of which believe in the OHKO and the other believed in raining down many blows upon the opponent

Meltan: Eats metal and melts it into part of its body
Melmetal: Punches really hard, when it dies it rusts and falls apart and turns into meltans
Marshadow: Lurks in the shadows and copies people’s powers
Zeraora: Uses it’s sharp claws to tear things apart and runs at the speed of lightning
Necrozma: Light is its source of energy, and it can fuse with solgaleo or lunala to eat their light and turn into it’s true form, ultra necrozma
Magearna: Was given as a gift to a King’s Daughter.
Cosmog and Cosmoem: Evolves into lunala and solgaleo

Diancie: Can create diamonds
Hoopa: Can teleport things through it’s rings
Volcanion: Creates steam
Xerneas: Can bring everlasting life
Yveltal: Sucks the life energy of everything around it and goes to sleep when it’s life ends

Genesect: Ancient bug, team plasma armed it with a cannon on its back
Meloetta: Controls feelings with its songs, can transform into pirouette form
Victini: Brings victory to people who use it in battle
Kyurem: Needs a hero to fill the missing part of its body, can fuse with reshiram or zekrom to do so and turn into white Kyurem and black Kyurem respectively
Thundurus: Shoots lightning and causes forest fires
Tornadus: Causes severe windstorms
Landorus: Makes crops grow, gaurdian of the fields
Terrakion, Verizion, and Cobalion: Fought against humans to protect humans, form the sword of justice
Keldeo: Terrakion, Verizion, and Cobalion taught it how to fight, can transform into resolute form

Darkrai: Protects it’s territory by putting people to sleep and giving them nightmares
Cresselia: Represents the crescent moon and brings good dreams
Shaymin: Can turn ruined land into a lush field of flowers
Manaphy: Able to bond with any kind of Pokémon
Phione: Offsrping of manaphy, oddly doesn’t evolve into manaphy
Heatran: Volcano dwelling creature

Jirachi: Grants Wishes
Deoxys: DNA from space they mutated and was exposed to a laser beam, pretty much an alien
Regirock and Registeel: Locked away, possibly for their power
Regice: Very cold and magma can’t even melt it
Latias and Latios: Highly intelligent, flies really fast, siblings, can telepathically communicate with humans

Raikou, Entei, and Suicune: Powerful legendaries created by Ho-Oh when 3 Pokémon died in a burning tower. Those Pokémon could have been Jolteon, Flareon, and Vaporeon, according to a theory.

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edited by
Where is Regigigas?
Also for Rayquaza: "Mega Evolution was first discovered by the first meeting of humanity and Rayquaza" - Bulbapedia
"related to dynamax in some way" Zacian & Zamazenta fought against Eternatus and parts of it are Wishing Stars (the thing that makes you able to Dynamax) and particles got around the area what resulted into Power Spots. Isn't that a major role?
Ok, forgot about reggigigas, I’ll edit it
regigigas also shaped contintents
It towed continents with ropes
Umm, Isn't Xerneas and Yveltal also have a role of life and death, a life cycle in which all ecosystem has with Zygarde prevent too much life and too much death.

Also, wasn't Ultra Necrozma's role (not normal Necrozma) ended up creating/bringing light to Alola, Z-crystals/moves from the Ultra story? Correct me if I'm wrong, really love Necrozma.