Originally posted by Sephiroth1999AD
I don't think the main purpose of FFX-2 was to (SPOILER)find Tidus. Maybe Yuna left on her journey because she thought she had seen him on a sphere, but she actually saw (SPOILER)Shuyin in that sphere, not Tidus. I think the game is more about Yuna's development from someone who does things to please other people to someone who does things because she wants to do it herself and because she chooses so.
Ok, while writing this post I was making way to many spoiler markers, so I'll just give an upfront SPOILER...

You are both right and wrong in what you say. FFX-2 had several purposes, several story lines, several outcomes. But Yuna started this journey because she saw the sphere Rikku showed her. No it wasn't Tidus, but she thought it was Tidus. Furthermore, she didn't even know Shuyin existed at that time, so she couldn't have thought that that person was Shuyin, she thought it was Tidus. During her journey, she finds very little of what she's looking for, instead she experiences a whole different story than she thought she would, but she still did all of this to find Tidus. Throughout the game she makes little side comments to herself about how she isn't finding anything that leads to him, but through the whole game she doesn't give up. And in the Farplane at the end of Ch 3 when she has almost given up her search, she hears that whistle (oh that look on her face and that music in the background...tears) which renews her mission through the rest of the game. But if you don't have that much percentage in the game that scene didn't have as much significance to the story as it would if you had attained more completion, reaffirming my notion that the Good Ending is too easy to get, and that it doesn't hold as much significance to the story as it would have if you were forced to get...oh say 95% completion, which is not terribly difficult to do.