LogFAQs > #978830835

Ultimecia basically chooses your party for you and completely messes up your junctions setup, so if you went in with squall Zell and quistis, she might change it to selphie squall and rinoa.

You can still win and put her in her place, but its such an unnecessary dumb example of trying to make the fight difficult by going "oh, you don't know who I'll choose to be in your party" and I'm not gonna junction all 6 of my party members as a just in case when I can only max Stat 3 of them at a time.