I am haveing trouble fighting yunalesca, all she does it that attack and put zombie on me then cures me befor I can get rid of it. Any seggestions?

Have lots of Holy Water. Put everyone in Overdrive mode(and also your aeons).

And if possible, have Yuna learn Holy magic, and if you've spared the White Magic Sphere that you found in Via Purifico(Yuna scenario), you can make Lulu(or whoever has high magic power) learn Holy.

and be sure to have at least one character in zombie status before you kill her in the second round, she will use mega death in the beginning of the third round that will kill anyone that isn't a zombie, better make that 2 because she sometimes uses Curaga as a follow up that will do a lot of damage on your Zombie character

also use your aeons because they can't turn into zombies

Thanks for the help.

I said screw saving money and bought tons of Holywater. Use them to give your armor zombieward then its a peice of pastry.

Okay one major thing is to put all your aeons into overdrive mode. That will help a lot but dont use them untill the end of her second phase and 3rd phase. Good idea to equip stuff that protects against zombie and also keep some people in zombie so she doesnt kill u all with mega death. I used shiva on her when she had less than 9999 left in her second phase. THen in her third phase just unload all your aeons overdrives on her and it should do a lot, especially bahamut because he does over 9999 already, so try that and it should be a sinch. Also, i had found places that gave u a lot of AP so i stayed there and got a lot of sphere levels, that helps a lot too.