In a large (gallon-sized) pitcher or vessel of choice, add the cranberry juice, pomegranate juice, Simple Syrup, grape juice, orange juice and lime juice. Stir to combine with a wooden spoon. Add ice to top up the pitcher or, if you prefer, put ice in the glasses first and fill with the punch.
Add the sugar and 1 cup water to a pan over medium heat. Heat, stirring, until the sugar dissolves. Let cool completely, then chill before using.