I'm really starting to get mad at these three bosses on my Final Fantasy X-2 game? Any advice?

Okay, the three bosses are: Mindy, Sandy and Candy...I think that's there names. Anyway, I have all three of MY girls up to the level 63, 66, and 65. BUT, Mindy, Sandy, and Candy STILL kill them =/ its only because those three bosses keep hitting them over and over again, not letting me able to hit them back with anything. Why can't i kill them?? I can't avoid them...i think. Any advice??I'm really starting to get mad at these three bosses on my Final Fantasy X-2 game? Any advice?
Oh oh Are you talking about the Magus Sisters?





So, there are two ways to go about this. First, it is recommended that you defeat Cindy first. This will take away their chance of healing and Not-So-Mighty Guard. She has a lot of health, so this will not be easy. Start the battle with a White Mage and two strong attackers. Be sure you have about ten X-Potions and a few Mega Phoenix. Try using a Samurai with Fireworks and Fingersnap. Fireworks is extremely strong and is capable of over 900 damage to each character. At first, have both of your attackers take down Cindy quickly. Have your White Mage cast Protect first, then Shell, or use accessories that nullify elemental damage; Mindy can cast those very quickly. Chances are they will execute at least one Delta Attack. After this, have your attackers use an X-Potion and have your White Mage cast Curaga. It is likely that Mindy will use magic before you can heal, but if she uses Passado, it will do no damage all fourteen times. Use Dispel and Fingersnap on the other two after Cindy is dead. Then, focus on Sandy, then Mindy. If you use a Samurai, the Nonpearil skill will guarantee a hit every time. Keeping your party healed is crucial to this battle. Have your White Mage cast either Cura or Cure throughout the entire battle. Prayer will be too weak and if you leave them un-Shelled, Mindy's magic and Passado will to tremendous damage. Sandy's Razzia will also leave you in trouble, but Shell will decrease the damage about half, and Protect will also cut Passado's damage considerably. Using Haste or Chocobo Feathers will also be beneficial, as you can score more hits on Cindy or whatever sister you choose to eliminate first.I'm really starting to get mad at these three bosses on my Final Fantasy X-2 game? Any advice?
Depending in which part of the game you are, Cindy, Mindy and Sandy will be at different levels. here are some suggestions and things you need to know to beat the bosses.





- Equip Yuna/rikku/paine magic defense or defence accessories. Eqiup accessories to make your defense or your characters' health higher.





- there's an accessory or dressphere that lets you have first strike so you would be able to attack them as soon as the battle starts.





THIS PART IS CRUCIAL, MAKE SURE YOU DO THIS BECAUSE IT WILL HELP YOU A LOT:


Make sure you have a lot of Lunar Curtains and Light Curtains and cast them immediately at the start of the battle or if you have a chance. They will take less damage from the enemies. Cast both Light Curtain and Lunar Curtain so it protects and shells the party.





- Equip lots of high potion or mega potions.





Use strong dresspheres such as alchemist, warrior, samurai or dark knight.


NOTE:


- kill one boss at a time, preferably Mindy (the small one) because she has the least health.


- use attacks that do a lot of damage