Arceus

Arceus is a white, equine Pokémon with an androgynous appearance. It resembles a qilin or centaur with a gray, vertically striated underside. The striated pattern also appears on the underside of its mane, tail, and face. Its four pointed feet are tipped with gold hooves. Its long mane juts away from its head, and its face is gray, with green eyes, red pupils, and a green circular pattern below its eyes. Arceus also has a streak of gold coloration on its head and ears, which point upward. Its neck is fairly long, with two pairs of extrusions to the sides, and a flap-like feature on the neck's underside that is colored white like much of the body. Arceus also has a golden cross-like wheel attached to its body by its round abdomen, which changes color along with its eyes and hooves based on its current type, depending on the Plate or type-specific Z-Crystal that it wields. The wheel also has four jewels attached to it. The pattern of striated gray of Arceus's underbelly continues past its waist. Its limbs have gray undersides and extrusions at the tops of the legs. Arceus's tail is similar to its mane in terms of shape and coloration. Despite its quadruped appearance, Arceus is capable of flight.
According to legend, it shaped the Pokémon universe using its 1,000 arms. Arceus has been referred to as "The Original One" in myths and legends and is generally considered one of the strongest Pokémon. Arceus is believed to be the creator of the Silentglen/Lodrain regions, along with the lake guardians: Uxie, Azelf, and Mesprit, as well as the Pokémon of Myth: Dialga, Palkia, and Giratina. Because of this, Arceus is thought to be one of the longest-lived Pokémon species. It has the power to recreate the Pokémon of Myth as well, presumably to guard the dimensions. Arceus is portrayed as having powers such as bringing back things that it once destroyed, making certain things vanish into thin air, halting time, and overturning the very laws of nature.
Arceus does not suffer fools gladly and will attack in a violent rampage if betrayed or deceived. It also holds long grudges if betrayed by those it considered friends. It is shown to be able to stop the destruction caused by a space-time void. Arceus has the power to not only calm Dialga and Palkia, but also destroy the Red Chain controlling them. It can release countless shots of light that disintegrate the landscape around it. Arceus can change its type at will to adapt to a situation through the use of its Plates or type-specific Z-Crystals. Arceus also has the power to split in two, creating a piece of itself to exist outside of its realm, which is implied to be its physical form—only a piece of its whole being—while its true form is unknown and incomprehensible.
Arceus was known to care for and safeguard the planet in ancient times, protecting the world from cataclysms such as meteors, and it would show gratitude and compassion to those who treated it with kindness. In modern times, Arceus continues to watch over the world and wishes for people and Pokémon to work together in the face of adversity. Even when it is needed, it only give on how to solve problems instead of directly interfering. Arceus can also give its blessing to other Pokémon through bolts of light, making them bigger and more powerful, as seen with the ancient hero's 10 Pokémon companions. This blessing is also passed down through family lines, as seen with the descendants of the hero's Pokémon: the noble Pokémon and ride Pokémon worshipped by the people of Lodrain.
Arceus resides in a realm beyond time and space. There, it appears as a large amount of golden light shaped like the silhouette of its normal appearance. This is supposedly its true form. It was also shown to be capable of human speech, stating that "Arceus" is simply the name humans call it. The first ancient inhabitants of the Lodrainregion, the Celestica people, worshipped it, referring to it as "almighty Sinnoh" and "great Sinnoh". Arceus also held the title "might of Sinnoh", with the term "Sinnoh" later on becoming the name of the region. In ancient myths, it is said that the Origin Ore, an ore of mysterious power, contains the power of Arceus itself.

Arceus

According to the legends of Sinnoh, this Pokémon emerged from an egg and shaped all there is in this world.

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Armor Class	25
Hit Points	28d20+2
Speed	80 ft. Walking	80 ft. Swimming	80 ft. Flying
Strength	25 (+7)
Dexterity	25 (+7)
Constitution	25 (+7)
Intelligence	30 (+10)
Wisdom	30 (+10)
Charisma	25 (+7)
Damage Vulnerabilities	Fighting
Damage Resistances	None
Damage Immunities	Ghost
Saving Throws	All
Skills	All
Languages	Common
Senses	Darkvision 200 ft.	Truesight 100 ft.
Challenge	15 (13,000 XP)
Action 1	Cosmic Power	Self	Arceus absorbs a mystical power from space to strengthen its defences.
While remaining in battle, you have a +1 to your AC
Action 2	Earth Power	Ranged Attack	60 ft., all targets
d20+10 to hit	Hit: 6d6+10 Ground-type damage	Arceus makes the ground at a point it can see	within range erupt with power.
Each target within a 20-foot radius of that point	makes a DC 17 DEX saving throw.	On a successful save, it takes half the damage
Action 3	Extreme Speed	Melee Attack	Range 5 ft., one target
d20+7 to hit	Hit: 3d6+7 Normal-type damage	Arceus charges at a target with blinding speed.
Action 4	Future Sight	Ranged Attack	Range 60 ft., one target
d20+10 to hit	Hit: 8d10+10 Psychic-type damage	Arceus blasts a target with a hung of psychic energy.
Action 5	Hyper Beam	Self/Ranged Attack	Range 100 ft., all targets
d20+7 to hit	Hit: 20d10+7 Normal-type damage	Arceus unleashes a 100-foot-long,	5-foot-wide beam of destruction.
Each target in range must make a DC 17 DEX saving throw	on a successful save it takes half the damage.	This move takes great energy.	On Arceus next turn it is unable to move or take any actions.
Action 6	Hyper Voice	Self/Ranged Attack	Range 30 ft., all targets.
d20+7 to hit	Hit:8d6+7] Normal-type damage	Arceus lets loose a horrible, echoing shout to inflict damage	Each target must make a DC 17 CON saving throw.
On a successful save, it takes half the damage.
Action 7	Judgment	Self/Ranged Attack	Range 60 ft., all targets
d20+10 to hit	Hit: 20d10+10 Normal-type damage	Arceus showers glowing beams	onto everything around it, inflicting holy judgment.
Each target must make a DC 20 WIS saving throw	on a successful save, it takes half the damage.
Action 8	Punishment	Melee Attack	Range 5 ft., one target
d20+7 to hit	Hit: 4d6+7 Dark-type damage	Arceus hits a target it can see	within range with a punishing strike.