Final Fantasy Fables: Chocobo Tales - Chocobo card

Credits mini-game:
Tap the letter 'O' when it appears in names and other words during the credits to earn a Silver or Gold rank and a card.

Get Omega Cannon card:
To get the Omega Cannon, select "Send" from the main menu and "Download Card." Press the L button twice, then Up, the B button twice, then Left on the D-pad.

Kingdom Hearts references:
Get to the house. Look at Croma and note the strong resemblence to Vivi from Kingdom Hearts. Go to the Mog's shop. Stand in the circle and note that the symbol is actually the Kingdom Hearts symbol.

Lightning tower password:
Enter "62 20 39" as a password.

Music Player:
In order to unlock the music player, complete the Story Mode. This option will then be available in the Sound menu, available in the main screen, by clicking the purple option in the lower part of the screen.

Promo cards:
Use a Nintendo DS Download Station to get the promotional cards Omega Cannon, Ultima Weapon, Ragnarok, Shinryu, and Chocobo.

Ragnarok card:
Select 'Send' at the main menu, then the 'Download Card Pop-Up Card' option. In the European version, press A, L, Left, Up, R2.

Shinryu card:
Select 'Send' at the main menu, then the 'Download Card Pop-Up Card' option. In the European version, press Down, X, R, Right, A, B.

Ultima Weapon card:
Select 'Send' at the main menu, then the 'Download Card Pop-Up Card' option. In the European version, press L, Up, Right, B, A, B.