It's possible you might be thinking of:
* His monkey-like agility: Ron is often depicted as being quite agile and acrobatic, but this is just his normal athleticism, not a special power.
* His "monkey fist" moves: Ron sometimes uses a fighting style that resembles a monkey's movements, but again, this is just a fighting technique, not a power.
Let me know if you have any other questions about Kim Possible or Ron Stoppable!