User blog comment:Kana "Saki Kuro" Clark/Level Up/@comment-24763722-20140419052948

I recommend using Quick Battle (Party). That can level up most of your characters ten times faster than one on one. If you wanna level up Tifa and Light faster, I recommend using these characters in order: Zidane, Kuja, Jecht, Lightning, and Tifa.

I did that once to Vaan, Shantotto, Firion, Prishe, and The Emperor and I seem to level up Firion and Prishe the most. It may be difficult, but when you do, good luck! ^_^