Final Fantasy XIII HD Gil/CP Farming (Adamantoise/Adamantortoise)

80k CP per kill (using a Growth Egg, 40k without one)
Possible Platinum Ingot (150k gil) or Trapazehedron drop each kill (Better chances using Item Catalog and it's upgraded one for rare items)

Also, you can do it with a summon technique if you're bored, have spare TP, or are not powerful enough to defeat these with this method:
   • Final Fantasy XIII HD Gil/CP Farming ...  

This strategy works on the adamantoise and adamantortoise in Gran Pulse. Suggest you do this after you beat the game since that will unlock crystarium level 10 (more stats)

My party is Fang, Lighting, and Vanille but you can swap by preference.
I would recommend each party member have at least 14k health, Genji gloves for Fang, and most crystal trees nearly maxed out (kinda have to be to have that much HP anyway). I have 3rd tier weapons for Fang and Lightning (upgraded Dragoon Lance and Lionheart) but I've done it with the 2nd tier ones. For Vanille I'm using the Malboro Staff for debuff effectiveness (2nd tier). You want a lot of attack power with 2 of your members, and a lot of magic with the other (for healing). All must have ravager available. The healer must have saboteur while the other 2 should have commando and either synergist or saboteur

Start off with Synergist Synergist Medic to get and do the cast order shown in the video (fang has bravera/protect, other two have protect(ra)/faith(ra), everyone has haste)
Switch to Ravager Ravager Medic and blast one of the legs until it breaks. If you aren't maxed out yet, get the percentage up an extra 100-200%
Switch to Commando Medic Medic and highwind that leg to kill it. Target the other leg and start attacking before switching (so the CPU targets it when you switch, instead of the head)
Switch back to Ravager Ravager Medic and break the leg
Switch to Commando Medic Medic and highwind the leg
Switch to Synergist Saboteur Saboteur and bravera/faithra yourself and lightning (important to have 2 saboteur or 1 saboteur+1 ravager to keep the chain going). Once you see the adamantoise with deprotect, deshell, and imperil...
Switch to Ravager Ravager Ravager and break it. Continue until the chain is up to 800 or 900%
Switch to Commando Commando Ravager and burn it down

Collect CP and hopefully an ingot/trapazehedron, move to the next one (there's 4 - 2 in the enclosed area and 2 roaming the plains). Save, quit, reload and repeat

Other things that may be of interest:
Shaolong Gui farming:
   • Final Fantasy XIII HD Shaolong Gui (D...  

Long Gui kill:
   • Final Fantasy XIII HD Long Gui Farmin...