Bear with me here, this might get a bit crazy.

But.

One thing they've continued to bring up again and again about Sun and Moon's box legendaries is that they're somehow "different" than what they've done with legendaries before. At first I thought, okay, it's probably just the usual E3 hypespeak to make everyone think there's something completely new or interesting about them when all we get is a new ability, signature move and a form change. But then I thought about this.
>Solgaleo isn't the sun, it's the emissary of the sun
>Lunaala isn't the moon, it's the emissary of the moon
And I figured, yeah, they couldn't be, we have our sun and moon legendaries already - Ho-oh and Lugia. But then, Ho-oh and Lugia already have "emissaries" - Ho-oh has the legendary dogs/cats and Lugia has the legendary birds, and that wouldn't
>Solgaleo is the green lion that devours the sun from alchemy
>Lunaala is a bat, which were considered "birds" in medieval/alchemy days

Could they be fourth members of both of those trios?