Unlocking one of the two new job cl***es in the PSP version of Final Fantasy Tactics is a
bit of a chore. The Dark Knight has many pre-requisites to unlock, but once that's done,
you'll have a powerful job on your hands.

To unlock the Dark Knight cl***, you must completely master the Knight and Black Mage
cl***es - that is, learn each of their skills. Also, achieve the eighth level with the
Dragoon, Geomancer, Ninja, and Samurai jobs. You must also must have killed twenty enemies
in battle to the point that the enemy disappears from the battlefield (three rounds).

dude iv got the dark knight before but this time i cant i have lvl 8 geomancer smaiurai
ninja and dragoon iv also mastered balck mage and knight plus iv killed MORE THAN 20
ENEMIES in battle and im in chapted 4 when i did all that in chapter 3 (yes im a high lvl
as ramza around 74)

Right so u have had the Dark Knight Job b4? Hmm Maybe u havent got the 20 crystals Per
Person (Kinda Tough If You Want a Whole Team Of Them :P, Over Kill Much?) Anyways umm
apart from that you shud get the job itself.

master knight,master black mage,lv 8 dragon,geomancer,ninja and samurai

This is crap i got that all in chapter 2 and im at the end now