I did it. It took about 20 minutes, in the three-strike area. I messed up a couple times, so it took about 45 minutes total. It's not nearly as hard as it sounds- only stressful.

Regardless, Lulu's ultimate weapon at true-power is worth it in spades. She deals almost 40000 damage in one turn, with me, and she only just got Flare. All you need is Flare, Doublecast, and the Onion Knight. When she gets Ultima, she'll be a literal god of death. On top of everything, it costs 4 MP to do it. She could sit and cast all day.