AYou know, they say Arceus is the most powerful Pokémon. Yes that may be true but he is not as powerful as you think he is.
Here are some reasons why.
1. If he was god then why are you able to capture him. This the problem with all legendary Pokémon as well. If the creation trio and Arceus are gods then why can they be captured into little balls by ten year olds to engage in cockfights.
If Dialga can control time, why doesn't he freeze you before you can catch him?
Comparing the game mechanics and all to the lore of the series isn't really...fair. Not to mention his catching event was never released and he was more a mystery gift that comes in a specific ball so I could argue this ball is a God send like a master ball.
2. The best feat of Arceus was he created the Pokémon universe. However that was only one universe, and he drained pretty much most of his power in doing it. Lots of people in fiction can create universes, but that doesn't necessarily mean they're powerful, especially if they waste almost all their energy in creating just one.
1) He created it as his birth to be fair. Also, he destroyed a meteor that was far bigger than one mega rayquaza destroyed which can be seen as one of the top three most powerful mons.
2) Do you know the lore? Even if we assume he used up a lot of his power to create the universe, that's still something impressive for that world unless something else can do that which last I checked, no one can. Plus, he is able to make another dialga, palkia, or giratina in a certain event with his own power so that entails some ability.
3) Because a lot of people can create universes doesn't invalidate that he's powerful. What do you even define as powerful? I mean, I'd say a pokemon that's good in battling and very strong could be deemed as powerful and Arceus is far stronger than that, not to mention invulnerable to moves if he has all his plates. I believe you mean more Godlike essence and in that universe it can be argued he is the most powerful since he can nullify anyone else's attacks with his plates.
4) Does everyone forget about the plates? I can argue him in the games is less powerful because he doesn't have all the plates. As for the meteor against him, well that still implies power since no one else could do it, he survived it and just needed his plates to fully heal, could change a land with just a few of them, has his own dimension that he made.
(Also the idea of every Pokémon game, being it's own universe is a fan theory. It does not mean Arceus is multiversal, because since when was Arceus a multiversal being.)
ORAS and RSE would like a word with you.
3. If he was god, then why did Arceus almost die from a meteor hitting him. I know a lot people say this is PIS, (plot induced stupidity), but still why did he almost die from a meteor. It's so stupid to see a so called god nearly die from a fucking meteor.
What is defined as "God". There can be many things that fulfill that statement that don't entail absolute omnipotence. Many things in fiction and games have this concept of a God that isn't completely invulnerable.
Regarding the meteor...he almost died because he lost all of his plates. He couldn't nullify the meteor's damage with his plates so he had to counter it. They all got lost and he needs them to heal himself from his wounds. Again, deserving a God status is via world mechanics rather than simply being more powerful than other beings in other worlds.
4. Arceus in order to be powerful, needs these so called plates. Since when does a god need something in order to be powerful.
I would list many but sadly some are spoilers so just stick with these.
Thor - hammer to channel his lightning till he learns how to use it himself
Kratos - weapons at his arsenal
Hades - underworld presence
Not to mention he doesn't need the plates to live. Else if that was the case he couldn't be in the games without dying. Notice how in the movie it was about damaging him while cementing him from moving and getting his plates out to heal. That's something I think you're getting wrong. You think he needs plates to live, but he doesn't, they're just additions to who he is as a being.
Not to mention even if he needed them to live that's hardly a crutch since they can adjust reality and be able to enact on his command. So even if you wanted to strike at them you'd need to damage him enough to get those out and then make sure he doesn't have a single one which is very circumstantial.
5. He had to struggle to fight the creation trio. He created the creation trio which means he is more powerful than them, yet he had to put up a struggle with them. If he was god he would have just instantly defeated them.
Did we watch the same fight? He was owning them and many of their attacks did nothing. Like, if you're asking why he couldn't just snap and they all disappear then he would have done that with the others. He doesn't have the ability to delete all that's around him instantly, he's still a pokemon, but he's still able to not only nullify their attacks but use an attack that can damage everyone at the same time super effectively depending on how many plates he has and which ones.
Those are just some of the reasons why I believe Arceus is powerful alright but he is a weakling compared to other gods in fiction. He's just not the powerful god many Pokémon fans believe he is.
I dunno it looks like he could handle many greek Gods and honestly I think you have a bit of his abilities/lore incorrect as well as not considering what his plate powers entail. Moves are extensions of matter and things. Water type is like using water, meaning with a water plate he's invulnerable to any water attacks. The meteor isn't like that since it's not an extension or could be argued not a matter he has a plate for. Many God's in fiction us an elemental thing for combat so he could be invulnerable from the as well as countering with all 18 elements he has.
Plus of course he isn't the most powerful when compared to others. The title "God" appeals to specific universes. Would you say that Kratos is weak because Arceus could beat him? Or others are weak because they need a vessel or some tool to do their more powerful attacks? If we get into crossovers of course but that's being unfair since you're judging him not on the rules of merit of "his" world but of whatever mythos fanfic OP powers you think are stronger.
One other thing that I say about Arceus was the fact that He was subdued by regular Pokémon and molten Lead or some other metal. I find that both stupid and funny.
1) It was cement and he was taking damage so likely he couldn't react to it
2) despite the damage he responded but couldn't move due to being buried
3) he didn't die since well...the future him remained the same and well (even if that's not how time works) it would entail Arceus of the future stopped existing
4) subdued is a strong word to use since he was still resisting
5) in the end he got out and just sat there angry. Like no joke, he just sat there angry and probably healing himself.
6) If you find a God being put in a predicament with current used weaknesses being used against him as well as the basis of being caught by surprise by someone you lent something to and trusted for their roles in helping you...then man you'd have fun with other stories where more powerful Gods by your own admission got into that role to.
Honestly, I don't think this is a good case on your part
Edit: I'm not saying Arceus could beat other God's in fiction that are clearly more powerful and all, I'm saying the way you're analyzing him is rather weak in arguing. I bring up the elemental abilities since that is a core factor when talking about the deity himself.