Is there rifling in a black powder ball muzzleloader?

It would depend on the type of gun,for the most part anything that is called a "rifle" has rifling in the barrel. A musket generally doesn't have rifling and is considered a "smooth bore" There are cases in both instances that cross the line such as rifled muskets (used in the Civil War) and weapons mistakenly called "rifles" as in you will hear a Brown Bess or charliville musket called a rifle. There are also guns called "Fowler's" these are for the most part smooth bore and meant for shot, but can also fire a ball, much the same as the musket.