Strategy: Jumbo Flan is HARD... well technically he's jellylike, and probably soft and squishy to the touch, but he's hard to defeat. Would you want to touch him, anyway? I wouldn't. Jumbo Flan absorbs all kinds of elemental spells, and has high Magic Defense to boot, so non-elemental spells don't do much damage. Don't even think about using physical attacks - no matter how high your strength is, all weapon-based techniques do 0 damage. Jae kindly informed me via email to try to use Ultima in conjunction with Doublecast and Copycat, and having road tested this, can confirm he's correct. To make this battle even easier, Slow Jumbo Flan by casting Reflect on one of your party members, then Slow on that same member. (Jumbo Flan is constantly in Reflect status, and casting slow on him directly will bounce it back to you- that's why you want to Reflect your Slow spell off a party member.) Besides Slow, Jumbo Flan is also vulnerable to Blind and Doom (count: 200), although seeing as he never uses a physical attack, and magic circumvents Blind status, I don't know why you'd want to use the former on him.
Alternately, make sure Anima knows Haste, Ultima, Lancet, and _maybe_ Shell and Dispel. Summon her, Haste and Shell her, and have her use "Pain" repeatedly, which is not weapon-based and will therefore do 99,999 damage if Yuna is moderately built up. If Jumbo Flan whittles Anima's HP down, use Lancet to heal her. When Jumbo Flan is close to dying, he'll cast Regen on himself, which you can Dispel if you like, or keep Paining him, and he'll probably die in two rounds at most. This is the fastest way to defeat Jumbo Flan, period.
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