Yuma is basically a big damage check. On Standard, you need to deal 10000 Damage in one turn or he'll fully heal himself (you need to deal upwards of 5000 Damage on Casual). There's a few ways around this however. You can inflict Paralysis or Stop to prevent him from healing, and he's quite slow, so most actions will go before he does (including a Banisher's Earthquake, which is rare).
Normally, I'd start off with Indra's Flames, then prep for Solid Stance + Sixteen Hand Slash and Deafening Roar + Earthquake for a quick kill, but I don't like using EX Skills before Grateful Seventh. So, I waited until things were set up perfectly for a Turn 7 kill, and just stalled out the first 5 turns.
Also, his ailment resistance is horrible...
Well, that was a fun damage check. Only one more boss remains for Chapter 6!
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