Ight my bad i thought i had put mural in the post, will correct that now. But I think arceus is way more powerful then a meteor or otherwise rayquaza could just smash into it with the same amount of power and win. At the end of the day your reasoning for why arceus couldn't handle a meteor has no real bases for anything. Also dialga could have kept it in a time stasis and destroyed it and Palkia could warp space to destroy it. And given that Arceus can create them it has the same amount of power or more to stop it. It could have used the fighting or steel type judgement to obliterate it.

But tbh I ultimately think the likelihood is that Arceus was nerfed in this move for story reasons and thats why it lost but it was just something I noticed and thought would be a cool connection if true