Are you sure zombie attack didn't work because it should.
**Spoilers ( I think)** This is MY strategy.
Well, before the battle you should try and get some of your Aeons in overdrive. Then, in the first part of the battle, cast zombie attack and leave the Yu Pagodas alone. That way, when they try and heal the boss they'll only hurt it. As you might have noticed, when Tidus talks to the boss, it's overdrive will decrease significantly. Since that option is scarce, I suggest you save it until later. *Note* if you use your Aeons, try to save at least one of their overdrives for later ( it should be your strongest one). Try using Rikku's Eccentrick to speed up overdrives. Use doublecast to cast your strongest spells. Manage your Mega-Potions and Mega-Elixirs as needed.
When lossing around 70,000 HP it will transform itself. At this point, try and use spells such as protect and Auto-Life. Now's the perfect chance to use your character's overdrives. Also, keep healing yourself!! Keep on doublecasting you strongest spells and start using Tidus' Talk command when the boss' overdrive starts getting full. When you see it's HP falls to about 30,000 HP, summon that Aeon you've been saving, which is hopefully one of your strongest, and it should finish it off.
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