My brother wanted his FFX back, so I was forced to rush through the last parts. I beat Nemesis, the Omega Ruins, got all the legendary weapons, and all but Tidus's Sigil. I tried it like 200 times and couldn't get it because the balloons would never spawn in a good configuration, and also when I get to the end there's always that one bird that spawns on top of me and I don't have a negative reaction speed, so I can't do it. So, I just beat the game, and now my bro has FFX. No international btw, so no soloing dark aeons.