"We will take back the freedom that was taken! No longer will we be slaves to the humans!"
Arceus seems to be serious most of the time, as to most he rarely smiles. He is kind of close to the legendaries and occasionally enjoys their company, even in a time like this when “war” is going on. He can keep his cool most of the time and it’s very hard to get him to freak out, though he can miscalculate things and at times, will be surprised if the results aren’t what he expected. But other than that, very hard to get him upset. Though he WILL punish those that he feels need punishing, he will be a little merciful, like with the humans. He could just wipe them out, but instead he gives them a chance to fight. Or maybe this is, in a way, him mocking the humans.
Unknown, but he was owned by someone before. It wasn't in a pokeball though. This means that there is someone that is more powerful than him... Seeing as how someone had to create Arceus, right? But then where is he? Why isn't he stopping this? Or maybe he just doesn't care? No matter what you know about him, only more questions will pop up...