I have a new idea for the story. You know how Reborn has four artifacts that need to be brought together to bring forth Arceus? What if we had 5 Pokemon (One from each area), that when united, would create a source of ultimate unlimited power. Celebi for the forest, Jirachi for the mountains, Hoopa for the Spirit Wasteland, Manaphy for the oceans and Victini for the city in the middle. Not only would this give each area a specific purpose, but it would also give Team Ultima another reason to use the SUPREMEs. For example, they could use a SUPREME Weezing to spew poison gas to kill the trees and animals in the forest and make searching for Celebi a breeze. A toxic breeze that is.
P.S. Welcome back Drymus!