Final Fantasy Fables: Chocobo Tales/Chapter 3

Now you have to head for the forest, which is basically all the way to the right of the town. On your way, you'll see a chocobo card with Bluebay on it. Free Bluebay and continue right across the bridge. Keep going right when you're in the forest (Marlboro Masher will be south from a twisted tree) until Croma stops you. When Peekaboo and Greeble leave, go to the green book. Completing battle mode level 2 will unlock a new path at the tree that was twisted. Go through the small passage in the tree and there will be another green book there. Beating battle mode on level 1 will be enough to be able to reach Croma. Shirma will then free Croma while you're on your way to him. Follow Irma and Golem will show up to help her, ready to duel you. Though you can't duel with a trainer deck. Shirma will suggest you go to Dueler X for help. You can find Mog back at the town central square, who will soon "transform" into Dueler X. Dueler X will give you a professional card case to replace your trainer deck. You can now have up to six decks, each one requiring 15 cards to duel.