Ralts is gotten earlier in the game and can take out those dragons and blaizken
Yes, but Ralts also takes up a Mega slot, and let's be honest, everyone is going to be using that slot for Mega Blaziken/other megas. I'm not saying that people won't still use it, that is just a downside to using it over Azumaril.
And yay! I have honestly wanted this remake for so long now. Generation 3 was my first generation, so it has a place in my heart (I have played the older games so don't go flipping out though). FireRed was my first game, and it was cool to see a mini remake of it in HeartGold and Silver. Now a Hoenn remake too??? Yay! Ruby and Sapphire are probably my favorite games, and I have been wanting this remake for a long time. I don't really know what it is about them though... I just love them. I greatly like all the starters (especially the Torchic line), and I like a lot of the other pokemon as well. You just don't get to use/see Hoenn pokemon much in other games. I also enjoyed all the cool little aspects about it as well, like the ships, contests, rainforests, and I just don't even know. I just love it. I wish I could explain better haha. I am so excited... :D I don't want everything to be completly changed though. Updated and slightly changed is all right, but not totally changed.
As for Mega pokemon... I would imagine that Sceptile and Swampert would receive them, as it wouldn't make much sense if they didn't. Everyone would just pick Torchic for Mega Blaziken... :( (I love you Blaziken, but I don't want you to be overused). I do not really want to many others though. Honestly, I feel like having to many kinda ruins stuff, as well as the specialty of a mega. If we have a large number, the are no longer unique and special.
So Mega Kyogre and Mega Groudon. Hmmm. Honestly I am leaning towards no megas right now, but I wouldn't be surprised if they did get them. I could see it going either way, and I would not mind either way.
I could have wrote so much and honestly typed a whole page, but I figured I would keep it very simple and basic so as to not take up to much room haha. I guess to sum everything up: The
nostalgia.
EDIT:
TheGamedawg pointed this out a few posts below me: Physical/Special split! It will be very interesting to play a Hoenn game with this split and I will probably use different pokemon now that some are better off.