How to Build a bump chart in Tableau
Drag month of date to columns, and region to rows.
Create a calculated field called rank.
Add rank to the text mark and set the table calculation to calculate for each month by checking region and unchecking month.
Move the region pill to color. Move the rank pill to the rows shelf, and copy it.
Set one axis to line chart and the other axis to circle chart. Create a dual axis.
Add labels, and format.