What happens for Omega Barrage if the Pokemon is Confused?
You need to flip for Confusion twice if you choose to attack twice. One flip for the first attack, then flip again if you decide to attack again.
Source: TPCi Rules Team (2015-02-05)

Relevant cards

Note: All applicable cards may not be listed below.
XY5_121
XY5_26
XY5_69
XY5_81
XY5_97