StreetPass is all well and good, but what if you live somewhere where there are few 3DS or 2DS owners? Thankfully, Square Enix is smarter than you give them credit for and there's an alternative way to reap the benefits of StreetPass from the comfort of your own home.
When your 3DS or 2DS is connected to the Internet, you can use the "Update Data" option from the Save menu (when you speak to the Adventurer or from the world map). By updating data, you will receive the following benefits:
Updated profiles for any friends you've already registered, if they've recently re-uploaded their profile. This is handy if you summoned one of your friends' characters and need a new one from them or if they've learned new abilities for Abilink.
Up to five random guest profiles from across the globe. These function the same as guests from StreetPass, so you can use their Friend Summon and you will gain an extra resident for Fort-Lune for each guest, plus any Ba'al they may have sent. Essential if you rarely get StreetPass tags.
Note : You can only receive guest profiles once per day.
A new Ba'al from Square Enix if they recently released one and you haven't already gotten the same one from them. Unlike Ba'als sent by other players, which scale to your level, Ba'als sent from Square Enix have a fixed level. Better get your Buster Ships ready!
Additionally, you will automatically upload your own profile, so any of your friends who Update Data will receive your new profile (and friend summon) and other players will too if they're lucky enough.