The Legend of Zelda: Spirit Tracks Cheats

Here's how you do it:
1. Get two copies of the game.
2. On your game, copy your file into the second save file.
3. On the file you just created, use tag mode with the other copy. Make sure that if you're using your friend's game, only trade stuff from their file that is easy to find, like Wood Hearts.
4. Exit and switch to your real file.
5. Use Tag Mode with the other game again, and trade the stuff you traded back. It is a good idea to have lots of Wood Hearts and Stalfos Skulls when you do this.
6. Tada! You now have a copy of whatever you traded! Rinse and repeat, and you'll have tons of rare treasure in no time.