I was planning to make this post around five days ago, but I held off because I was going through a lot of stress at the time. I'm back now that I gave myself some time to rest my mental health.
Pokémon: Arceus and the Jewel of Life is the twelve Pokémon film released in 2009. Thousands of years ago, when the world was in peril of a massive meteor, the supreme Pokémon Arceus destroyed it but was gravely wounded. It would had died if it wasn't for a man named Damos, who healed Arceus by returning its elemental plates which were scattered by the blast. In gratitude, Arceus used its water, grass, ground, electric, and dragon plates to create the Jewel of Life, a magical artifact that restored Michina Town, reduced to a wasteland from the meteor, into a beautiful paradise where humans and Pokémon could prosper peacefully. But by the next solar eclipse, Arceus required the Jewel of Life to be returned. Once the solar eclipse came, Damos instead lured Arceus into a trap by having Pokémon electrocute Arceus (as the ground plate was one of its missing plates), claiming that if the Jewel of Life was taken, he feared Michina Town would turn back into a wasteland. His plan failed as Arceus grew too strong and used Judgement to destroy the temple, killing Damos and his followers. From the damage, Arceus forced itself into a hibernation.
A thousand years later, Arceus recovers from its wounds and returns to modern day Michina during the next eclipse to claim its revenge against humanity. Arceus goes on an uncontrollable rampage, destroying everything in its path until the Creation Trio (Dialga, Palkia, and Giratina) were forced to step in to stop Arceus from nearly destroying the world. When Arceus turned too powerful, Dialga warps Ash and the gang back in time to properly return the Jewel of Life.
We later learn that Damos betrayed Arceus only because he was being brainwashed by his vizier Marcus. Now, this proposal is not for the movie Marcus, as he's an extremist given how he generally wants to protect his town. The manga adaptation of Marcus on the other hand, is a different story.
Who is Marcus
In the manga version of M12, Marcus never gives any justification for his actions that he's doing his actions for the sake of his town. Instead, he rants about his plan to kill Arceus out of belief that if he kills the god of Pokémon, he will become a god in Arceus' place. When he discovers Damos' plan to return the Jewel of Life to Arceus, Marcus has his Bronzong mind-control Damos and has him summon a horde of Pokémon, all controlled by special armor they're wearing, to attack Arceus. This leads to Arceus killing everyone and being reduced into a forced recovery hibernation. From the damage caused to Arceus, this causes distortions in Dialga's Temporal World and Palkia's Spatial World, resulting in them battling each other in Alamos Town, making Marcus indirectly responsible for the events in the previous two Pokémon films/manga adaptations The Rise of Darkrai and Giratina and the Sky Warrior (as the two's battle pollutes Giratina's Distortion World).
After Ash, Dawn, Brock, and Sheena were sent into the past, they tell Damos about what his actions will do if he doesn't return the Jewel of Life, unaware he was controlled by Marcus. Seeing this as an advantage, Marcus gives Sheena his staff with the Jewel of Life in it and sends her to the temple in Damos' place once the eclipse begins. At the temple once Arceus arrives, Sheena realizes Marcus tricked her as the Jewel in the staff was simply a glass fake. Worse, since he knew of what would happen, Marcus improved his trap by pouring silver water (liquid metal) all over Arceus as the Pokémon electrocuted it to further weaken it. When Marcus observes this, he statistically smirks watching Arceus in immense pain. Then heroes arrive to stop him, warning Marcus of the space time continuum if Arceus dies. Marcus shows no care for the outcome as long as he becomes a god and orders his Bronzong and Heatran to kill them and anyone else against his willpower to become a god. They are on the losing side until Sheena and Damos (after being freed from his prison cell by a spiky-ear Pichu) use their telepathic powers to reach the Pokémon's hearts, making the armor lose their mind control abilities and the Pokémon turn against Marcus. Ash snatches the Jewel of Life from Marcus and manages to return it to Arceus before its almost dies.
With his ultimate plan foiled, Marcus refuses defeat and activates his final mechanism, which causes the temple to collapse and take everyone inside it with him. Fortunately, Arceus awakens in time and teleports everyone away to safety, leaving Marcus the only casualty.
None. Unlike his film counterpart, there's no indications to suggest Marcus is doing his actions for the safety of his town's prosperity. All he seeks is a promotion to godhood by killing the god of Pokémon, and was fully willing to kill all who stood in his way of becoming a god.
He's also shown to be quite cruel to his own Pokémon. There's a scene where his Heatran attempts to resist the armor's control when Marcus orders it to attack the heroes. He promptly kicks the dang thing repeatedly until it finally accepts his request.
Arceus has a much higher body count than Marcus' zero (excluding himself), but it has its reason for destroying the modern-day Michima because of Marcus using Damos to betray it into thinking all humans deserve justice. And once Ash returns the Jewel of Life, it calms down and restores everything it destroyed back to normal. Also, when the temple collapsed, perhaps it was a good thing that Arceus rescued all the humans and Pokémon still inside, except Marcus.
There's been other Pokémon villains who sought the powers of a god to become gods themselves. Manga Marcus takes it a bit further by attempting to kill god to become a god in its place. I say that's enough to give him a yes.