But the main character already defeated/captured Groudon/Kyogre, how would they make that work? Have the old character make a cameo?
The main character defeated/captured Groudon OR Kyogre. Not both. They both only appeared in Emerald, the battling of which were not canon (only Rayquaza's battle was canon) since they both took place post-game. Much like the reverse in Ruby and Sapphire, how Rayquaza wasn't canon, since it wasn't part of the storyline.
If you're a gamer, it is your responsibility to share this with everyone you know: http://youtu.be/jHmDjNCZR3k
Hmm... You know, I came into this thread thinking "Oh great. Another anti-Gen-3 gamer, here to say something else would be better... What is it?" But I agree. As long as Gen 3 makes it into the modern times with updated graphics, battling systems, mechanics, and some new addition, it could be a brand new game or the old ones again.
Though I admit I'll miss playing as badass Brendan. :P
And to Quetzalma, they could make it so as the old characters released the Legendaries or something. Plus, it's possible to beat the game without capturing them (why anyone would, I have no clue...). Who knows? They did it with Black 2/White 2, so it's possible.
http://nightsbeta09.deviantart.com/ I'm also a Let's Player on YouTube! I LP my favorite games! http://www.youtube.com/user/BetaNights