I love Mt. Pyre; it reminds me a lot of Lavender Town due to its eerie feel. In ORAS, I think it would be sweet if they'd include some secret path here, leading you to some legendary like Giratina. Another thing I'd like to see here is a more range of wild Pokémon, specifically ghosts. Lots of new ghost-types have been introduced since generation three, and what better way to make them available in these games than having these Pokémon roam Mt. Pyre? Story-wise, I don't know what could happen... personally, though, I think it'd be really nice if they had used this place to have Rayquaza reveal its secondary form, if they do decide to give it one? Rayquaza's more related to Sky Pillar than anything, but I don't know; I just can't think of anything better, haha.