Question: how to dunk in 2k19?
Answer: Lace up your favorite pair of basketball shoes and grab your controller.
On Offense, hold down R2 (PS4) or the Right Trigger (XB1), then move the Right Stick on the controller. ... 
While moving toward the basket, move the Right Stick in any direction to dunk. ... 
Initiating a dunk is only part of the process, though!