Chill everything: Cold juice and sparkling water make a better mocktail. Pop them in the fridge for at least 30 minutes.
Prep your glass: Fill a tall glass with ice.
If you like, rub a lime wedge around the rim and dip it in sugar for a light sparkle.
Mix the base: In a separate small pitcher or shaker (no need to shake hard), combine 1/2 cup pomegranate juice, 1 tablespoon fresh lime juice, and 1 to 1.5 tablespoons ginger syrup.
Taste and adjust: If you prefer more zing, add a splash more lime. For more sweetness, add another small drizzle of ginger syrup.
Add the bubbles: Pour the mixture over the ice, then top with 1/2 to 3/4 cup sparkling water. Stir gently to keep the fizz.
Garnish and serve: Add a lime wheel, a few pomegranate arils, and a slice of fresh ginger or mint.
Serve immediately.