OK, so i went and did some timing on the best areas to CP grind in chapter 13 (this is where you get the first oppourtunity to return to Gran pulse) I have a stage 9 crystarium so i havnt defeated orphan yet.
ok, so ill do this in CP per second, and hours. ok.
SO, first up is the Famous grinding spot at archylte steppe, where you engage in battle between a king behemoth and a megistotheiran, once completing the battle, you run away a bit and fight just a behemoth king. then you return to the area where behemoth king and megistotherian was fighting, and repeat the process. so i gotthese stats:
Per cycle: 10600 (fighting the behemoth and megi battle then battle the other behemoth is one cycle)
Per hour: 252000
Per second: 60
Next up is the area in taijins tower, where you fight 5 pulsework gladiators, then head upstairs and fight 2 managarmars, then continue to fight two pulsework gladiators, then head back downstairs and repeat the process (this is in tier 2/tier 3 of the tower) So these are the stats i got
Per cycle: 13000
Per hour: 270000
Per second: 75
And finally, the best option, near the end of orphan's cradle where you have the oppurtunity to fight wladislus (i think that is his name) he is the cie'th that uses a sword he is also very skinny. One would take the elevator and fight him, the go back down the elevator and head all the way back to where the black goddes statue is (gives you the option of returning to the entrance of orphan's cradle) then heading back to teh elevator and repeating the process (the elevator is to the left side of the room. anyway, these were the stats i got
Per cycle: 32000 (one battle with him)
Per hour: 576000
Per second: 160
so thats it guys, if anyone else knows any oter good grinding areas let me know, and i will update this post with the stats.