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Strider - regarding Intangir, all you have to do is cast Invisible on him, then Doom, and he's a goner. It's actually quite easy.
Other than that, I always take my guys through the cave near Thamasa until they're at level 45 or so before I go to the Floating Continent - not only does everyone know damn near every spell of every Esper by then, but they're at level 45, so the Floating Continent is a breeze and you can just focus on getting all the cool stuff there.
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I just use the Floating Continent. No Triangle Island, no Sealed Cave, nothing but good ol' Floating Continent.
The Ninjas mentioned earlier are easier to beat when you have Shadow throw Bolt Edges at 'em, they go down pretty easy. Those, and the Bedpans...err, Brainpans, I mean. They suck, but again, Bolt Edges do pretty well. Just go through it a couple times and it'll get pretty easy, then proceed when you're ready to go.
