I'm really sorry for being vague. I've improved my question:
In Final Fantasy III, there are extra quests to unlock extra content, such as the Legendary Smith and the Onion Knight job. To access these quests, you need to send 7 mail to another player. Once you do that, you must send mail to NPCs.
You can send mail over WiFi to another WiFi-connected DS. This is referred to "sending mail to a far away friend." You can also send it with the DS Wireless system with the same method they use with PictoChat.
If I have a friend with a DS and a Final Fantasy III game card, can I send 7 mail to him over the wireless and still get the quests, or do I have to use WiFi?
Best Answer
The Nearby Friend option uses the same method of communication as the chat room in the DS System so you shouldn't need a wireless internet connection to use it
As for the sidequest, that would refer to sending mail to the other ingame characters, you can see which ones give you an Ultimate Weapon sidequest and which one gives you the Onion Knight sidequest (Ultimate class and tribute to the base class 'Onion Kid' from the original Final Fantasy III)
EDIT: i should note that these quest shouldn't need a connection to do since you obtain them from the ingame character mails