Both, layered. Pomegranate has punicic acid (omega-5, brightening); Rosehip has retinoic acid (cell turnover). Together they target pigmentation from two angles.
For pigmentation specifically, rosehip is the specialist — its pro-vitamin A profile is the reason it dominates tone-and-texture routines. Pomegranate plays better as a firming, antioxidant support act. Serious dark-spot routines: rosehip nightly, SPF daily, patience.