In another world he was the creator but in this one he's just a father
Arceus is god, or at least a different version of him. He decided to take a vacation with his family to experience the life of a regular father.
Unfortunately being god in a world where god is dead means you'll have lots of people showing up at your doorstep.
[Arceus image]
[Creation trio image]
Arceus abilities:
Idk
(He's god he can do anything duh)