Party setup - Vanille(Saboteur), Fang(Saboteur), and Hope or Sazh (Synergist)
Equipment - ATB+ items on Vanille , Collector's catalog
Method - just have vanille summon right of the bet to disable the adamantoise's leg, then just spam death until he dies
***Keep in mind that Death actually has a very low chance to hit, you can increase that by casting Vigilance + Haste on vanille and Curse on the adamantoise. that way i can kill a adamantoise almost every try(max 3)****
You have a chance of getting a platinum ingot ( Sells for 150,000 ea) or a Trapezohedron (worth 2,000,000 for upgrades) as well as 40,000 xp.
I don't think the Oretoises are any good for CP farming. Too much risk vs. CP output. I prefer running through Mah'habara and OHKOing the weak enemies in this one loop, gets me about 44,000 CP every 5 minutes or so. I heard there was an even better strip in that location too.
Also, why do people use Eden for Oretoise farming? Why not kill the 4 in the Archylte Steppe?
Why do so few people know what "Irony" means? http://ui04.gamefaqs.com/963/gfs_75574_2_16.jpg