I was originally going to go with communications but it seems like that's not as developed in this world yet. So it'll likely be from intenational shipping. A company three or so generations old. I'll likely have it headquartered in Sinnoh or Unova. Although, I'm thinking approaching this from the point of view of someone who's Arceus's equivalent of an "I go to church sometimes" Christian. Even better in that apparently Arceus itself asked not to be worshiped. I'm still thinking on his actual approach to the religion. Kind of depends on the backstory I come up with i guess. Whether his great-grandparents, grandparents, and parents were devout and how they reacted to Arceus appearing, whether they hammered that into their children and let them choose their own path, how much he enjoys his worldly possessions, etc etc.