defeat small metal heads and collect dark eco until dark jak is ready.Then die and hold r1 this gives you dark jak.dark bomb metal kor to remove most of the first part of his health then use the vulcan fury to finish that bar off.shoot him a few more times in his second health bar.if you look you will see that you can use dark jak again.dark bomb and vulcan fury him again.now he will chase you.roll to avoid blasts and to get away and jump over shock waves.while running and jumping shoot kor with blaster.after a few shots from the blaster metal kor wil be defeated.
you could also cheat the game by using glitches :D
I don't know if this works in the PlayStation 2 version, but in the PlayStation 3 Collection if you mash the down arrow at the very start of the battle (as Jak is turning back from Dark Jak) you stay as Dark Jak at no eco cost and can take out all of the stingers and half of his first health bar. Also, save up your dark eco from the stingers to help you finish him off at the last stage. MateoJak 22:15, April 11, 2012 (UTC)