Miami Marlins
Although they have not thrown an MLB pitch in 2024, Christian Bethancourt threw 210 pitches that were tracked by the PITCHf/x system between 2016 and 2023, all of them occuring in the MLB Regular Season. In 2023, they relied primarily on their Change (65mph).
In 2023, compared to other RHP:
Their change (take this with a grain of salt because they've only thrown 10 of them in 2023) comes in below hitting speed, is basically never swung at and missed compared to other pitchers' changeups, results in more flyballs compared to other pitchers' changeups, has slight cut action and has an extreme amount of backspin.