I have tried both triangle and X (and not at the same time), but I'll try that again.
The real problem is that you can't summon Stitch _enough_ to help. I have eight of the possible nine drive gauges (haven't beaten the Lingering Spirit yet), but I can still only summon _twice_ each round. That means either one round of Stitch and one Peter Pan, or two of Stitch and no Peter. And since Stitch only earns about a hundred points for each Ohana, and I need 1000+ per round, that's nowhere near enough.
With one Peter and one Stitch, I'm getting a little less than a thousand each round, and winding up almost two thousand short. It's extremely frustrating, and I'm just at my wit's end. (My record is something like 8600 points.)
EDIT: Lawl. Sorry; I found this on a SEARCH for Final Mix +, Titan Cup, Jiminy. A quick scan caught the Lingering Spirit boss fight and I assumed.
More politely, I don't suppose you know how to beat the Paradox Titan Cup, since Peter Pan no longer works? (He does too much damage in Final Mix, only comes out twice because his limit now costs *five* gauges instead of only three, etc., and I wind up *2000 short* of the goal. Gah.)