Where can I manage a chain of 6 battles in Dissidia 012 Duodecim and what items do I need?

Answer 1

Try Gabranth's dungeon and you need multi chain............

Answer 2

Go to Chapter 12-3 (Laguna) and take a Cross Chain to the third gate (Gateway to Decay). Stand right next to the gold manikin and execute the Cross Chain; you'll chain the other five manikins, then the one-hit one will be tacked on at the end. If you have Laguna at level 8 or better, this will be a relative cakewalk.