There are multiple ways to define how good a pitch is. The slugging percentage off a certain pitch, the spin rate of the pitch, how whiff percentage, Fangraphs’ linear weight values, among others. There is also ways to quantify how well a pitcher plays the pitch off another, thanks to Baseball Prospectus’ pitch tunnel stats. The Pittsburgh Pirates feature three pitchers in AJ Schugel, Felipe Rivero, and Tony Watson who are excellent at throwing the changeup.
AJ Schugel
According to Brooks Baseball, Schugel threw 497 fastballs, 280 changeups, and 40 curveballs, or 60.