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My theory:
>You will get your version's legendary pokemon early in the game, not as a party member but as the equivalent to the Nobles or the Ride Pokémon. Potentially you'll be able to catch the other version's box legend (or both) to use in combat.
>The point of the game is to beat gym-like challenges associated with some of the pokemon types, and as you beat the challenges your legendary will have the ability to change its body to traverse terrain (for instance, beating the Water gym will allow the legendary to grow fins to swim like Basculegion, Flying gym will let the legendary grow wings to fly like Braviary, etc.)
> This legendary's ability to change its type and characteristics will tie to the battle gimmick which has already been speculated to have something to do with typing