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Part 133 - Battling Dark Ifrit.
This is harder than Valefor for sure, but still easy if you got fairly high stats.
Dark Ifrit has higher stats overall and packs decent defense/Strength.
His health is around 1.4 mill.
Again, if you have high STR, Attack reels will make short work of him and Slice n' Dice will do a lot as well.
Blitz ace might not do enough without crits, which requires luck stat.
The simplest strategy is to just use Auto-Phoenix & Carry 99 phoenix downs. When he reaches overdrive be ready to use Auto-life or switch to an Aeon.
Honestly, go here and fight him when you still have moderatly low stats for a great challenge and fun!