Although not incredibly surprising, Secret Bases will be returning in Omega Ruby and Alpha Sapphire. For those of you who played Ruby, Sapphire, and Emerald, Secret Bases were areas players could set up for other players to download into their games. Once downloaded (via mixing records using a Game Boy Advance Link Cable) players could battle a computer controlled version of their friend's team. Not only that, but players could buy items to decorate their base, with some items working like the obstacles in Gyms.
Since Omega Ruby and Alpha Sapphire are remakes, there are upgrades to the system as well. Rather than having to physically link up, like in the past, players can share their Super Secret Bases (SSB) via Streetpass. This means if you go somewhere where a lot of people have a copy of the game (like a tournament or convention) you may find yourself with many new trainers and bases in your game.
Even people who don't attend these sort of things can still get bases in their games. The games also support a QR code function that allows players the ability to create QR Codes to share online. The QR Code "map" saves to the players SD card in their 3DS, so once they generate the "map" the player can remove the SD card and upload the QR code to various social networking sites. Although it is currently unknown if the SSB Trainers will keep the teams that they have at the time or if the team will be generated when the base is created, it's likely that the trainers will have their current teams. At the very least, this is how the Secret Bases in Ruby and Sapphire worked, so there isn't any reason to think this system would work any different. Players can also set up the kind of battles they hold in their secret bases. Single and Double battles are likely, but we may also see Triple and Rotation. If we are lucky, we may even be able to set up some really weird rules, like Inverse or Sky. I plan on making a Fossil Team for my SSB trainer to use, I'd love to also choose an obscure ruleset to make my opponent's sweat.
The Super Secret Bases will also have other functions, for example you can collect flags from players bases and show off how many you've found (as seen as the flag number on the above QR code). This function was not present in the original Secret Bases, however it was present in the bases players could set up in the Underground area of Sinnoh in Diamond and Pearl. Another new feature is the ability to become "pals" with the other Secret Base Trainers (the computer controlled version of your friends) and then have them visit your base of do favors (like hatch eggs) for you. Again, this was not present in the original Secret Bases, but it is similar to how your friends could do you favors in the Join Avenue of Black 2 and White 2.
Thanks to Team KO member Patrice for posting info on Facebook about this!