...read this. NOW.
1) Go to the Gate and talk to Copper.
2) Say you want to visit a friend's town, and then pick Nintendo WFC.
3) After your DS connects, quit out of the Friend's Town list.
4) Notice anything unusual by your house? Your mailbox has a new letter!
5) Enjoy the coinage.
Sure, some of you may already know this, but I simply HAD to share it with everyone.