Better-Ball-UI is a utility module designed for Pixelmon. It displays the capture probability for each Poké Ball in the "Poké Balls" list of the battle inventory; no configuration is required after installation, nor are any additional buttons needed.
The displayed values are not fixed in advance; rather, they are calculated by the server based on Pixelmon’s own capture determination logic. Factors such as the target’s current health, any abnormal conditions, bonuses associated with different Poké Balls, and the species’ capture rate are taken into account during this calculation, and the results are then sent to the client. As a result, when the Poké Ball used changes, or when the target’s health or status changes during the same battle, the displayed values update accordingly.

