1. I don't think we'll be getting Gen 4 remakes this gen. Assuming a third version or second pair in Kalos, plus the expected new-region game, I think it would be too much to also add a Sinnoh game to the mix - we'd be talking about five distinct games (not counting paired titles) within the generation. I just don't see that happening.
Meanwhile, they like to include other generation legendaries in games other than the first in a generation. We were able to get one of the three Sinnoh legendary dragons in Johto. I could see an opportunity to get either Palkia or Dialga in Hoenn at some point. And if they're going to make the change in this generation, I'd expect it to happen in this game.
I do like the idea of Ho-oh and Lugia alternate forms, but I think it's harder to explain the alternate forms... unless they're megas.
Ah, sorry, I through you were considering buffed up alternate formes instead of redistributed BST Formes. I just went head straight, sorry.
Yeah, regular alternate formes for the rest of the Origin Trio within this generation would be likely I think if they end up being distributed.
I don't understand how people associate Steven with Aggron. Metagross is his highest leveled pokémon. He gives you a Beldum. You will probably not even see his Aggron in the double battle in Emerald. Metagross is his first pokémon in World Tournament (all trainers have their ace as the 1st pokémon).
Honestly the only time Aggron is his ace is in the anime. If that misleads people to think that it is his ace in the games aswell I got yet another reason to dislike the anime.
That's no the only time animé changed up the aces of the game characters, for example Alder's signature is Bouffalant in the animé and it is openly stated to be his strongest, even though the entire point of his hairstyle comes from Volcarona.
But yes, considering that Steven's bracelets have been moved from his elbows to near his wrists to imitate Metagross' feet, I think Mega Metagross is very likely. Unfortunately, because it is supposed to be surprise for us, I don't think that we will see it in the pre-release period(not to mention Metagross is not trademarked, so they are not planning to have much Mega Metagross merchandise right now).
Probably to give us a reason to get Diancie(Aside from adding it to our collection) as it might do something in ORAS to obtain it's Mega Stone, we already know the event one comes with a Normal Gem so it can't come with the stone.
Not to mention Diancinite currently simply does not exist within X/Y at all, period, to ensure people to transfer Diancie to obtain the Mega Stone and buy the new games to do so.