Quote Originally Posted by nik0tine
Indeed I am, Necronopticous.

However, I need help YET AGAIN!

Now im in the encephalon and Tiamut is whooping my ass. I read a guide, and it helped a little, but not much. One thing I did notice though, is that he mentioned something called the "double buster". The author asid to gaurd with Jr. until he has six AP (Which can be accomplished by gaurding for one turn, correct?) The author then said to input Trianle, circle, circle, OR square, circle, circle to active this "double buster". However, both of these are invalid commands. They don't do anything.

So, can someone explain what this double buster is and how to use it? Also, could you please provide me with an acceptable strategy to beat this SOB if you happen to have one? Thanks.
I never bothered to get Double Buster (hell, I beat the game without any of the good accessories, and at a low level too), but I'll tell you how to beat him without it.

For Tiamat; his attributes reflect either Shion's or Jr.'s souls. Essentially, that means he'll attack differently and have different weaknesses based on which of those two goes immediately before him.

If Junior goes before him, Tiamat will switch to 'Jr. Mode' and use a single-target physical attack on one of your characters. He will also be weak to ether attacks during this state. I used boost to make sure that Jr. went 1-2 turns before Tiamat, and then had Shion and Chaos pummel him with ether attacks. Just don't let him go into 'Shion Mode' or he'll use a rather strong multi-target attack that deals a couple hundred damage to everyone.

As long as you Life Shot/Medica All continously with Shion, it should be relatively easily. Just remember that you MUST kill Tiamat with Jr. and Shion, not your third character.