BeeDog said:
I should be strong enough, but I still don't have a good tactic to kill them with (relative) ease. :/ Got any good tips for the -toises?
-Fang/Hope/Lightning
-One maxed Gaia Ring on each character
-as many Genji Gloves and +STR/MAG accessories (str/mag depending on the character)
Start off with syn/med/syn, fully buffing everybody (it's better to control Fang and do as much of it manually as you can, otherwise she'll often only cast one buff per turn, which is slower than casting several of them at once).
Then, switch to rav/med/rav, go after one of the legs, once it staggers, raise its damage% a little bit (once Fang's got a maxed Stagger Lock weapon and maxed crystarium, you won't need to raise the damage% past the stagger point), and then switch to com/med/rav and Highwind it, it should take the leg out. Repeat this process for the other leg (you might want to stay in com/med/rav and target the other leg, THEN switch to rav/med/rav, otherwise Lightning might start attacking the Adamantoise's head instead of going after the leg right off the bat, and that'll slow you down).
Once it goes down, IMMEDIATELY switch to sab/sab/sab and land slow/imperil/deshell/deprotect on it as fast as you can, and then switch to rav/rav/rav to drive it up to 999% damage multiplier, then com/com/com to finish it off. If you're strong enough, one round of this ought to suffice to kill the damn thing. If it recovers and stands up again, or if your damage multiplier looks like it's running out, immediately Highwind the head for massive damage as a last-resort attack.
I've got all three characters maxed in every role, and three fully maxed ultimate weapons (quick stagger/siphon boost/stagger lock) and can do this process in about 2:30 and don't need to grind any TP between battles, just reload the Adamantoise. If you're having too much trouble, go from:
rav/med/rav
com/med/rav
syn/med/syn
sab/sab/sab
rav/rav/rav
com/com/com
to taking out com/med/rav (you can switch to Cerberus when you need to Highwind a leg, it'll also raise your total damage boost and make the move more powerful) and replace it with Sen/Sen/Sen for surviving stuff like Howl and Quake (although the Gaia Rings ought to do it for the former).
I'm thinking of maxing out Lightning's Attack: ATB Charge weapon, though, since Quick Stagger really isn't such a great ability upon closer examination of how it works, and speeding her up significantly (same as what Hope's Siphon Boost weapon does for him) would be fantastically handy.