During the series' long history on the air, Pokemon the anime introduced fans to some of the most powerful creatures ever conceived. Although the series focuses primarily on the adventures of young, aspiring trainers as they gain strength, the reality is that the world they inhabit is quite dangerous, mainly due to the power displayed by the beasts that dwell within its depths.
From monsters capable of manipulating reality at will to literal creators of the universe, the nooks and crannies Pokemon the world harbors creatures with power no human can fathom. Among them are a handful that could be considered deities, as even some of the strongest trainers in the series would never stand a chance of defeating them.

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10
Lugia
Originally created only as part of Ash's anime adventures, Lugia is a guardian of the seas who keeps peace around the world. Lugia is a peaceful and friendly animal that prefers to hide underwater to avoid creating massive tornadoes every time it flaps its wings. Yet behind the desire to maintain order lies one of the most ferocious adversaries anyone can face.

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According to legend, Lugia is responsible for preventing the three legendary birds from destroying the planet with their constant battles. Lugia is able to fight this group of powerful Pokémon without any help. Most impressive of all, Lugia was able to last a battle against Hoopa Unbound longer than most other Legendaries, a feat that cemented her as one of the best and most powerful talking monsters in the series.
9
Mewtwo
Probably one of the most popular characters ever introduced Pokemon franchise, Mewtwo was born as a clone of the elusive Mew, with the sole purpose of becoming Team Rocket's ultimate weapon. After freeing himself from his imprisonment, this powerful Psychic type began to travel the world, leading to several battles in which he was shown to be superior to powerful opponents.

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Mewtwo's greatest strength lies in his impressive mental abilities, far beyond those of ordinary humans. Combining his incredible stats, which are among the highest in the entire franchise, with a strategic mind that can put even the wisest of trainers to shame, Mewtwo can overcome almost any obstacle. If all else fails, he can always rely on two awesome Mega Evolutions that greatly increase Metwo's abilities.
8
Giratina
Once a member of the Creation Trio, the group of Pokémon responsible for shaping the universe in the legendary lore of the series, Giratina is a dark and vengeful spirit banished to the world of Distortion for his crimes. Trainers tremble with fear at the sight of this demonic creature, as few have been able to stand in its presence and live to tell the tale.

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During the best few Pokemon In the movies, Giratina is shown to be much stronger than many of the other Legendaries introduced in the anime. It was able to keep both Dialga and Palkia, the other two members of the Creation Trio, at bay, at least for a few moments. His ability to create portals to the world of Distortion, either to escape or to trap opponents within, also gives Girata a tactical advantage in combat.
7
Rayquaza
Dragons in anime have often been popular due to their immense power and PokemonRayquaza is no exception. Guardian of the sky and protector of Earth, this ancient lizard has kept the planet safe from interstellar threats for centuries. Whether Rayquaza is destroying asteroids that could cause the apocalypse or facing off against aliens trying to get to the planet, this monster has done it.

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Rayquaza is never afraid to face aliens and can often end a battle in mere seconds, as was the case with Deoxys. His best achievement in anime comes from Hoopa and the Clash of the Ages film during which Dragon-Type fought against several of his legendary counterparts and remained in control.
6
Zygard
While Ash has encountered and more often than not ignored the idea of capturing a plethora of legendary creatures, there are a few that were crucial to the events of the anime. Zygarde, Bonnie nicknamed Squishy, was not only vital to the safety of the world, but also proved to be a beast far more powerful than any trainer could imagine.

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After returning to 100% form, a single tendril from Zygarde was enough to deflect an attack from Ultimate Weapon Team Flare, which was said to have enough power to destroy an entire planet. Squishy was also able to destroy the machine without any real effort, resulting in a massive crater that obliterated the machine and added Lysandre to the short list of gruesome deaths seen in the franchise.
5
Eternatus
While many legendary v Pokemon anime have demonstrated powers that can only be compared to the destructive forces of nature itself. Eternatus, the origin of the Dynamax Phenomenon that took place in the Galar region, goes one step further and becomes a galactic threat that could easily wipe out the world.

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In its base form, Eternatus was already capable of defeating the teams of some of the best Gym Leaders and Champions in the franchise. Unleashing its eternamax transformation, this beast became so powerful that even the invincible Leon couldn't do any significant damage to it. While he was eventually defeated thanks to the Galar Guardians Zacian and Zamazenta, he was on his way to destroying the world with his virtually infinite energy.
4
Don't own
When thinking about the best Pokemon or those with the most overpowered abilities, it's not often that fans think of the mysterious Unown. Many fans believe that these creatures belong in the Legendary category because they are rare and bizarre. However, this is not true as they have abysmal stats, can hardly hold their own in combat and prefer to avoid conflict.

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However, the anime gave the Unown powers that make them one of the greatest threats to the world ever, namely their control over reality itself. Working together, the Unown can rewrite the world around them, shape it in their image, control other beings, and even summon powerful allies to fight alongside them. Although not the most immediate threat, these little creatures harbor a power that could end the world as fans know it.
3
Hoopa (unbound)
It's often hard for fans Pokemon anime to clearly define a monster's power level, as battles against these titans tend to be short. One of the few examples of the franchise's true power shown by a legendary Pokemon is Hoopa in his unbound form, which easily fought against several opponents.

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The genie-like monster faced the vast majority of the strongest Pokémon in the franchise and quickly defeated them before moving on to its next target. His power was such that the heroes were unable to defeat him in combat, instead having to resort to being trapped in a magical vessel. If not, there's no telling how much havoc Hoopa could have unleashed.
2
Ultra Necrozma
Introduced during Generation 8 Pokemon franchise, the Ultra Beasts were presented as incredibly powerful other-dimensional beings born in a cold and unforgiving universe. Legends say that this other world was once cared for and illuminated by a single being named Ultra Necrozma. Rather than an ordinary creature, it is best to think of this beast as a cosmological force.
The energy released from his body when at full power is practically infinite, causing burns to anything that gets too close due to the immense heat. The lasers that emanate from his claws can travel vast distances and cause destruction on an untold scale. He also has the ability to open dimensional wormholes to travel between universes, giving him a way to ambush opponents when needed.
1
Arceus
Over the years, anime fans have been introduced to several deities who view the universes they inhabit. Yet none are as interesting as Arceus, the creator and protector of the whole Pokemon world. No one quite knows how this being came to be, or what its true form and power are.
The version of god seen by the trainers is simply an avatar, created so that humans can understand the power of their creator. As such there is no being in Pokemon a canon that has more power than Arceus because he is responsible for the existence of all other legends, common monsters, and even humans that walk the world.