Can I use Victini's "Victory Star" ability to reflip for a failed Confusion check?
No, Victory Star only applies to flips that are done as part of the attack. You cannot use it for checking status effects.
Source: Noble Victories FAQ (2011-11-17), PUI Rules Team (2011-11-17)

Relevant cards

Note: All applicable cards may not be listed below.
BW11_23
BW3_14
BW3_98
BWP_BW32
BWP_BW32
SM2_10