This small mod displays ability tooltips when you mouseover a pet during a pet battle.
The default UI will list each ability on a pet's tooltip and whether it's strong or weak against the current opponent. This goes a step further and displays exactly what each ability will do to its current opponent.
The primary use is for analyzing the abilities of an opponent's pets and their potential effect on your current pet. Though it can have some secondary use to see what effect your sidelined pets will have against the currently-active opponent pet.