Weighted vest walks and agility drills.
My calves are probably the best calves in the known universe. It might be genetics, but I believe a major part of it is that I walked a lot as a teenager/young adult, and still do.
I also play football (as a DB), basketball (as a guard), and tennis. All three require a lot of sprinting at full speed, planting a foot to stop, and then accelerating the opposite direction.
I never fiddle with calf raises or the like. Again, maybe some of that is natural, but I don't think I get calves like mine just from a stoned father and absent mother.