2 (0.13 ounce) packages unsweetened lemon-lime flavored drink mix (such as KOOL-AID®)
2 cups white sugar
8 cups cold water
1 (46 fluid ounce) can unsweetened pineapple juice
1 (2 liter) bottle ginger ale
1 quart lime sherbet
Stir lemon-lime drink mix and sugar together in a large punch bowl.
Pour cold water and pineapple juice into the sugar mixture; stir until sugar and drink mix have dissolved. Slowly pour in ginger ale and gently stir.
Float scoops of lime sherbet in the punch just before serving.