Within the main building of the agency, you’ll find several amenities, including a shop, inn, and a Save Sphere. There’s also an Al Bhed Compilation Sphere, but I probably think you’d already have used one if you needed it back around Baaj. Save your game and leave for a scene.
Thereafter in the morning, there will be a brief encounter with a man who gives you a Lv. 1 Key Sphere - this is useful in removing blockades on the Sphere Grid. (On the Expert Sphere Grid, you could also backtrack and remove the blockade near the start so you can start accessing "Rikku’s" abilities more readily.) If you leave, you’ll run into Rin, the owner of this and other travel agencies across Spira; he’s an Al Bhed, too. He’ll hand over the Al Bhed Primer Vol. VIII and two Mega-Potions . Leave the agency after saving to find a boss!
BOSS - Chocobo Eater
Let’s begin with a brief description of this fight’s battlefield. The battle takes place on five slots, which you can effectively number 1-2-3-4-5. You will be in the second one, while the boss is in the third. If the boss pushes you off the edge of the first slot, then you don’t have to deal with him, but gain no rewards and start immediately from the Oldroad. If you kill the boss outright or push him off the fifth slot’s ledge, you win.
The Chocobo Eater is a bit of a physical powerhouse; his main attack typically hits for 250~300 damage. He can also use Fist of Fury - this will come after a "You’re next!" message, showing who will be hit. It does easily 1,000+ damage, so expect to Phoenix Down that character on the next turn. He can also use Blizzard , Ice-elemental damage to a single target. And, finally, he can push everyone back: this will be through an attack hitting everyone, removing 18.75% of their current HP in the process. So it won’t kill you, but it’s 3/16 (almost 1/5) of your HP.
With this battle, you’ll clearly want Lulu casting Fire a bunch to hit the boss’s weak point. Wakka will make a great ally in this fight, too: this boss is suspectible to Darkness, so Dark Attack helps get rid of that pesky physical attack. Then also lead with Auron to use Power Break to get rid of some of the damage from the physical should it hit. Once Blinded and Broken, it will be best to switch immediately to Yuna and bring out Ifrit, then have him use Fire, since his Fire is most likely stronger than Lulu’s. (Plus, the Overdrive.)
If you opt for a more orthodox offense, it will be best to keep it up with Lulu, Auron, and Yuna (for healing). With each 1,200 damage dealt, the boss will be knocked on its back, at this time only being able to use Blizzard. If you deal 500 damage to it, it goes back a slot. Just keep up the Fire and healing and you ought to be fine after this.