**Cyber-Robin, Its easy once you get to know the controls..
So I have just defeated Krieg, Luffy was 12 lvl and it was still challenging, But you can do it if you use luffy's regen special to heal from Kriegs redicilous special attacks.. once the fight is over two cut scenes will be shown, and wow, they reanimated the end of the fight of their battle, it was pretty sweet : )**
XD kreig was easy just do this
-
Be at least Level 8 with Luffy
-
Buy 10x Fire Balls 10x Water Balls
-
Enter the fight, heal when you have to, use all balls up.
One ball hits 175.
175*20 =3500 Krieg dies, now Its Arlong thats hard