Athal
Never use Dark attacks against Duo, try having recovery/barrier/invisibility chips to prolong your life(Hp programs are recommended aswell.)
For PA's you can't use groundbased ones like Pithockey... Life Sword PA and others swords with Proto Soul is a
must since Duo doesn't stay in one place.(and Proto can charge swords(except PAs).)
Yeah, I finally beat him and I don't use dark chips. Thanks to you know I'm on hard mode. ^_^