Well I found this great vid on youtube which details a great way to farm CP, Traps and Gil so I thought I would share it for you guys who want all the achievements (like me ^^)

Adamantoise killed with no Summon/Death spell

As you can clearly see this is an awesome method combine it with mission 63 (Crushed By Doubt) it is the best way to farm everything as the secondary prize for M63 is a Gold Nugget (worth 60k) coupled with the occasional Platinum Ingot and rare Trap this is in my mind the very best way to quickly farm cp/traps/gil.

For those of you who don't know where the mission 63 stone is, its in Sulyya Springs - Subterranean Lake its a purple stone can't be missed, the nearest teleport stone is in Sulyya Springs - Ceiling of Sky.

My quickest time for killing Adamantoise is 2min 30secs... so yea, really easy.