Final Fantasy X Help Thread (Spoilers possible)

[Ralz]

I'm trying to complete the Calm Lands monster capture mission, but after I get one of every other fiend, including the Stolen Fayth, there is still one missing. Anyone know what it is?

[Doomtrain]

Its a noob question, but i just want to know a quick levelling up process.

Omega Ruins is too tough for me. Yet, i managed to whoop ass on Yunalesca with no worries. I have all the Aeons up to Anima.

Simply put, i cant beat Sin before he goes into Overdrive mode. I figure i just need to level up some more and get stronger.

[FF_FrEaK]

Its a noob question, but i just want to know a quick levelling up process.

Omega Ruins is too tough for me. Yet, i managed to whoop ass on Yunalesca with no worries. I have all the Aeons up to Anima.

Simply put, i cant beat Sin before he goes into Overdrive mode. I figure i just need to level up some more and get stronger.

Well if its really difficult you could always use the Celestial weapons. Those weapons can break the damage limit of 9999. That's how I beat Sin Overdrive easily. I can't think of anything else other than leveling up, which would take too much time. So yea I say you should go with Celestial weapons.