Boss Battle :: Crawler ; Negator
HP : 16,000 ; 1,000
Weakness : Lightning ; none
Ok i gave you 2 option...
First take out the Negator. It was disables your magic abilities and Aeons while it's around, so deal with it. Make sure Wakka's in your party at this time. After defeating the Negator, you can finally use magic and summons. However, eventually it will begin a countdown to its mana beam attack. This sweeping attack can cause lots of damage to the entire party. The only way to ensure that your party will not get hit is to have an Aeon in battle at the time and use the Shield ability on. Choose the one with the most HP. Ifrit or Ixion might be a good choice, since they can reheal themselves with their own magic. After its done, continue with Thunder attacks until it is defeated.
OR
no need to take out the Negator make your party with Tidus, Auron, Wakka. So the Crawler will not use Mana Beam attack when the Negator is around and use normal attack & use a lot of hi-potion to healling ur partys.......