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Alright, imagine this:
ORAS:
> Important battles will start out like pic related, a proper Vs. intro, in 3D
> Battle Frontier returns in all of its glory from Emerald.
> Gym Leaders, E4, Champion will all have rematch teams, all of their aces will have Megas
> May/Brendan are actually competent Rivals or at least competent enough to fully evolve their starter and will challenge you in Sootopolis City
> Wallace is the Sootopolis Gym Leader, Juan can be challenged either in Sootopolis City to a battle, or in Lilycove City in a Contest
> Steven is the Champion, and will partake in a Double Battle with you some time postgame, he teams up with Wallace, you team up with Wally, all of their aces would have Megas, Metagross, Milotic, and Gallade respectively
> Steven will also still team up with you in Mossdeep City against Maxie in OR or Archie in AS
> Both teams will try to summon their Legendaries, both are summoned, Rayquaza tries to stop them, but the cover Legendary of your game becomes Primal, defeats the other and sends Rayquaza off at bay, you're then suggested to catch it to help you take down the Primal one or just face it right away, defeat it and Archie/Maxie again and it calms down, you can face it again and catch it after
> At some point in the game, Steven will give you the Diancieite, which you can send to a Kalos game where you receive Diancie