Your first task upon arriving in Luca is to go visit Maester Mika on Dock 3. Follow the red arrow on the screen to the north.
The next scene takes place in the locker room of the Besaid Aurochs. Wakka will present you with an opportunity to go over the basics of Blitzball, one of the primary side games and side quests in Final Fantasy X. Take the time to read through the tutorials and then head over to the Blitzball section for more tips and tricks but you won’t actually be playing Blitzball just yet.
Follow the blinking red arrow out of the locker area when Yuna and Tidus decide to go find Auron. Head into the locker room on the other side of the platform before you head down the stairs. There is an Al Bhed Primer (volume VI) sitting on the ground behind the man in green and at the end of the hallway you will find a treasure chest that contains two Hi-Potion.
Now go back out and down the stairs but head around to the docks on the left before you leave Luca Stadium. On Dock 1 (check the menu screen to verify which dock you are on) you will find O’aka XXII. Go a little bit further down the docks to find a treasure chest that contains 600 gil and then even further down the docks to find one that contains the Tidal Spear.
Continue north-east around the docks over to Dock 2 and you will find another treasure chest that contains two Phoenix Downs. Skip past Dock 3 and Dock 4 and go straight to Dock 5. You will notice on your mini-map that there is a small trail that leads between the two boxes. Go in behind the stack of boxes to find two treasure chests, one which contains an HP Sphere and one which contains a Magic Sphere.
Go south from Dock 5 and you will find yourself back at the entrance/exit to Luca Stadium. Continue down the stairs and down the pathway away from the Stadium. You’ll get to watch another short cutscene involving Yuna attempting to learn to whistle. Take Yuna and go north (from Luca Bridge). Head in through the front doorway until you find yourself at the front desk of the Sphere Theater and then grab the Al Bhed Primer (volume VII) sitting on the ground in front of the stairway.
Go back out to the bridge and continue into next area which is called Luca Square. You can speak to the woman in red near the vendor carts to but items and weapons. Go up the stairway at the north-east end of the screen to reach the Luca City Limits where you will find a treasure chest on the ground. It contains 1,000 gil.
Now go back down to Luca Square and enter the building at the north end of the screen. There is another quick cutscene at the tavern. Tidus will interrupt to mention that Yuna has disappeared and then Lulu will tell both Tidus and Kimahri that Yuna has been kidnapped by the Al Bhed. As mentioned by Lulu, the Al Bhed can be found at dock five.
Walk back across the bridge and over to the Stadium. You may want to save at the Save Sphere as you have a few battles coming up (though they are all relatively easy). The east walkway has now been blocked off so you will have to travel through Docks 1, 2 and 3 to get to Dock 4.
You can buy items or weapons from O’aka XXII at Dock 1. Another interesting note is that the treasure chest containing 600 gil will have been refilled, so grab it again. Continue over to Dock 2 to get the story moving again.
The battles against the Machina are fairly easy. The Machina are weak to Thunder magic so make sure to abuse that spell. Continue through Dock 3 and 4 and you will be thrown in to two more similar fights.
Dock 4 leads to a boss fight.
Boss Battle: Oblitzerator
You do have the option of defeating this boss the regular way utilizing attacks and magic to slowing bring down its HP. It has 6,000 HP though so this method is not the fastest.
Use the Trigger Commands to have Tidus attempt to use the crane. When the crane fails to operate, Lulu will mention that it is probably out of power. You need to use three Thunder based attacks on the crane in order to power it back up.
Keep your team healed up and utilize tools such as Tidus’ Cheer and Haste abilities while Lulu uses Thunder on the crane. Then have Tidus attempt to use the crane one more time. The crane will clamp onto Oblitzerator and rip off a piece dealing nearly 5,500 damage to it. From there Oblitzerator is easy to destroy.
Make your way back into the Auroch’s locker room for a short cutscene. Go back into the locker room and speak to Wakka to initiate the game. You can save before hand if you would like to make multiple attempts. This is a fairly difficult game to win as the Besaid Auroch’s are a terrible team. Check the Blitzball section for tips and tricks to help you win.
The reward for beating the Luca Goers is a Strength Sphere - not all that great of a reward., so don’t waste much time trying to win. The game has been setup to be nearly impossible for two reasons:
1) You can’t use any techs in the first half because none of them have been setup
2) The game is scripted to end in a tie at the end of the first half
3) On account of the storyline, Tidus leaves the game substituted by Wakka at the 3 minute mark in the second half
This leaves you with about a 3 minute window to score a goal with Tidus’ overpowered offensive abilities and then you have to spend the remainder trying not to get scored on, which is a surprisingly difficult task…
You will be thrown into a battle at the conclusion of the match against a total of seventeen Sahagin Chiefs at the conclusion of the match. They are very easy to defeat. Just watch that your HP does not get too low and use a Potion or a Hi-Potion if it does.
The next fight involves Auron again fighting against a Vouivre. One regular attack will kill the Vouivre. Wakka, Tidus and Auron will meet up and be thrown into a battle against a Garuda. Another very east fight. Use potions if any of the team members get low on health.
Maester Seymour will take care of the remaining fiends by summoning Anima - a very cool cutscene. You will be given one more opportunity to save your game and then follow Auron and the red arrows back through Luca to meet up with the team.