Moonflow and Guadosalam
These two Episodes are easy to complete, so they’ve been combined onto one page, starting with Moonflow.
Moonflow South Bank
Travel east to find Tobli hanging out with his crew near a half-submerged Shoopuf along the banks. Talk to him, and he’ll offer to let you join the musicians on stage. Select the “Let’s go onstage!” option, and you’ll get to watch a ‘performance’ of sorts, with the option to switch the camera views using the 
and 
buttons.
Press the 
button when you’re done viewing the scene, which should be pretty quickly, because there’s really not much going on. Yuna, Rikku, and Paine will see Tobli off, and the Episode is Complete.
The next destination is Guadosalam.
Guadosalam
Approach Leblanc’s Chateau and a scene will play out involving the musicians. Tromell will talk about how the melody has helped “deliver them from their fate,” whatever that means. He laments about the Guado’s miserable fortunes and how the tunes from the musicians have helped ‘salve their weary hearts.’
Speak to Tromell one more time, and Rikku will ask whether he should become the leader of the Guado. Tromell initially declines, then reluctantly agrees after Bayra, Donga, and Pukutak talk him into it. This last sequence will complete the Episode.
This will transport you back up to the Celsius, but you’re not done in Guadosalam just yet. Warp back down to the 
Save Sphere and head into Leblanc’s Chateau. A short cutscene will play, and you can exit after that.
Next, look for Tromell on the left side of Guadosalam near the door that’s been locked this entire time. Speak to him one more time, and he’ll permit you entry into the room that was supposed to be the “final resting place for the memories of the Guado,” where he now allows you to take what you need.
The lady inside will mention Lian and Ayde if you completed all of the steps involving them.
Before leaving, talk to Tromell one more time for a cutscene about the Guado, then speak to the unnamed female Guado, who talks to Yuna about Lian and Ayde’s adventures. Both are worth Story Completion Percent.
She will give you the 
Tempered Will Garment Grid as a reward, and then you can open up the two treasure chests in this room. One contains 
Baralai’s Sphere and the other contains a 
Tetra Bracelet accessory. Head back up to the Celsius and make sure you watch Baralai’s Sphere (which is called “Yevon’s Secret” in the Treasure Spheres menu).
Access the “Treasure Spheres” menu when talking to Shinra and select “Yevon’s Secret.”
Both Moonflow and Guadosalam are now complete. It’s time to head to the Thunder Plains next.
Checking the “Moonflow and Guadosalam Complete” box adds the Story Completion Percent for the automatic scenes in Moonflow and Guadosalam.