Farming:

• Obtained: drop off of all wyverns in Riverne Site A or B. Cannot be bought or traded; must be farmed.
  
• Number needed: one
  
• Optional or mandatory: mandatory
• Use: pass through Unstable Displacements.
  
• Notes: one scale is traded to the displacement to allow passage for a short time. After trading the scale activate the dispacement and choose to pass through. Anyone in or outside a party can pass through, but the displacement will become unusable again after a short time. A new scale is needed for each displacement. At minimum, one are necessary to reach Monarch Linn.

Farming:
Hippogryph Tailfeather

• Obtained: drop off of all hippogryphs in Riverne Site B. Can be traded but not sold on the auction house. You may be able to find some in bazaars.
  
• Number needed: two per mismelt, several mistmelts recomended
  
• Optional or mandatory: optional, highly recomended
  
• Use: traded for mistmelts in the quest Fly High
  
• Notes: Ouryu is far more dangerous in the sky. Using a mistmelt will force him to the ground. Two hippogryph tailfeathers are necessary to complete the quest Fly High given by Ferchinne in the Tavnazian Safehold. This quest can be completed multiple times to obtain many mistmelts.
  

He he he. Lesser Roc! It's like Roc, only lesser! Okay, sorry. They don't aggro.

Much like Riverne A, once you get what you want you can just avoid enemies all the way to Monarch Linn. The route is as follows:

• dark green dot = portal along the route
• red dot = unstable portal along the route
• blue dot = portal leading somewhere you don't want to go
• purple dot = unstable portal leading somewhere you don't want to go
• yellow dot = portal leading to the map quest moblins (don't worry about this now)
• orange dot = portal leading to Bahamut battle (again, don't worry, WAAAY in the future)
  

Because it's hard to read here is a text account of the route:

After zoning in take the single displacement on your island at (M-9). You'll then be on the main island in Riverne B. This is a good place to farm the lowest level Pyrodrakes and Nimbus Hippogryphs to get as many tailfeathers and the one dragon scale as you'll need. Once you've traded in your feathers for mistmelts back in the Safehold, continue north to the displacement at (J-7). The next island is also in (J-7) and has two displacements. Choose the one to the northwest. Head west to the single unstable displacement you'll need to use at (H-6) and get your party through. Continue west to the displacement at (F-6), then head due south to one at (E-7). The single displacement south at (E-8) leads you into Monarch Linn.

Unlike A, you need sneak at some points in Riverne B. The molbor mob Lunantishee detects with sound so use oils as necessary. Pyrodrakes and Ignidrakes detect with sight. Nitro Clusters detect with both sight and magic so use your powders and oils around these guys. Nimbus Hippogryphs and Strato Hippogryphs detect with sight and have true sight so avoid their gaze. If you're paying attention, sneaking across these islands is a simple task and there is no reason to fight any of the later monsters at all. Head into Monarch Linn to contfront your true foe.

Fatty Dragon:

Ouryu gives lots of people trouble, and for good reason. He’s strong, resistant, and generally nasty. On the ground he has several AoE forward moves, and in the sky he has tons of nasty damaging AoEs. He is an earth-based dragon and casts Stoneskin and and stone damage magic a lot. Basically, he’ll shred you all if given half a chance.

The key is not giving him the chance. Fortunately, he’s pretty predictable if you’re knowledable and have the mistmelts.

Open with a Dispel on his starting Stoneskin, and if you’re using the two-SMN Astral Flow method, Invincible and two Astral Flows. Keep that tank alive and avoid his frontal AoEs. Don’t stand behind him, as he can use a tail move too that can wipe your party in one hit. When he is at about 15% damage, he’ll take to the skies. He’s worse up there, so this would be a good time to use a Mistmelt. A Mistmelt forces him to the ground. He'll also land if you hurt him enough, but if you hurt him to land him, he actually uses a move called Touchdown that does light (about 100) AoE damage. If you use a Mistmelt he doesn't use Touchdown.

• Dispel Stoneskin every chance you get.
• Ouryu is much stronger in the air than on the ground. The AoEs come fast and are damaging. Get him down as fast as possible using a Mistmelt.
• Ouryu can be slept, but only on the ground.
• Ouryu's 2-hour ability is Invincible, which he uses at a a mostly random time.
  
• Lightly-armored characters (such as mages) should stay to the side of him to avoid his frontal and rear attacks
• Dealing damage in bursts (such as two BLMs casting Freeze at the same time, or an Aerial Blast and an Eagle Eye Shot) allows you to keep Ouryu slept and only wake him up when you're ready to deal a powerful set of attacks.
• Garuda is mostly immune to Ouryu and will do great damage with her 2-hour.
• At 30% life he will give up

• Obtained: obtained through the quest Fly High in the Tavnazian Safehold (can also be bought off the auction house)
• Number recomended: at least three
  
• Optional or mandatory: optional, highly recomended
  
• Use: forces Ouryu to land
  
• Notes: Ouryu has several poweful AoEs in the air. Also, all melee attacks will miss and he cannot be slept while he's flying. To keep the battle in your favor, use a mistmelt every time he takes flight.