G-Max Rapid Flow deals damage and hits the target even if it is protected by a protection move, including Max Guard. Its power and whether it is a special or physical move depends on the move it is based on.
Except in certain circumstances, successful hits with this attack become critical hits. Ignores passive skills that would reduce the damage of this attack. Ignores passive skills that would protect the target against a critical hit. Ignores the target's Damage Guard Next effect.