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Final Fantasy X | PlayStation 2
Its always useful to level up your characters and to get everyone's overdrive gauges full before hand, this applies to all boss battles.
Crawler: 16000 hp
Negator: 1000 hp
The crawler has a negator that floats above it and prevents you from using spells and aeons. If you eliminate the negator then you can use magic, unfortunatly so can your opponent.
His normal attacks and counter attacks aren't too bad, there is one Gatling gun attack that targets all characters that can be nasty,If you believe your characters are strong enough to defeat the crawler without magic don't eliminate the negator.
If you choose to destroy the negator the crawler will unleash his Mana beam attack after a count of three turns. This powerful attack can be prevented by attacking first with a spell, thundara is useful considering the crawler is a machine type. If you use this tactic it will prevent the move as a new negator will appear and magic/ aeons will be prevented again.
If you are unable to prevent the crawler from using mana beam it would be a good idea to summon an aeon to intercept the damage. Furthermore if this tactic is used, it's advised you also max all aeon overdrive gauges before the battle aswell, to inflict maximum damage.