Answer:
I am the best thing that can happen after a stick hits a ball.
Some try to hide, some try to cheat, but time will show we always will meet.
I am carried by mad animals.
I get wet when drying. I get dirty when wiping.
Bright as diamonds, loud as thunder, never still, a thing of wonder. What am I?
No matter how little or how much you use me, you change me every month.