Ok got the Platinum , it took me less than 1.5 hour to profit 10,000 thanks to the Clock Master skill, I even used my Green Chocobo
On a side note I can't believe I wasted 6 hours grinding 2 Adamantites and other stuff to get the "ultimate" weapon, The black Paradox weapons (you get from Hope) ended up more powerful after I got all the fragments :/