Friend codes are now specific to the 3DS rather than the individual game.
Can't look at the 3DS right now to help, but I hope that points you in the right direction. --- Creator of Jay's Journey (see quote!) "It's not ten years old! Therefore, it sucks!" - Nostalgia whores everywhere
3ds home screen. Hit the top smilely face. Scroll over to your card and look at the bottom. That will show your friend code. You can past it in your sig so other people see it. --- PSN ID: GreatDragon358 3ds Friend Code: 2981-5890-1146