A whole lot of brand-new water-logged Unown! Phht!But what else could possibly be located at the Abyssal Ruins? It doesn't seem likely that this would be location for the remaining legendaries.
Of the Unova legends, the only ones not given a location were Meloetta (unlikely, considering a hacked Meloetta has already triggered that event) Keldeo (see Meloetta, but most likely considering that an ancient people being swamped with water would consider it the "End of the world"), and Genesect (who's probably tied to Route 117)
In at least one remake, And I don't recall which, but all three of those had at least one PKMN roaming. And as was said HG/SS had the Weather Trio Tower as well.Yes, but there's obviously been a lot of work put into the ruins, and it seems to be an important place. They're not just going to give focus to an old legendary. The birds roamed, the dogs were events, as were the Eon Twins.
You know, the more I think about it, the more I think it would be a much epicer game if the Unova capstone game, or a re-make thereof was set in the past, with the player as the "King".