Jushin Thunder Liger, I froze in place when I saw him running from one end of the ring and leap over the top rope on to his opponent in the outside of the ring with a summer sault at WCW's at japan. There are many acrobatic wrestlers, but this one has really hard to duplicate moves, plus he's very creative. Check him out on youtube if you can.
It's a little tough to describe but here goes. It's sort of like the Ninja Special from the Day Of Reckoning games. My cousin can do it real good, but instead of cartwheeling, he flips in midair without using his hands and then does a whisper in the wind plancha over the top rope. I've hyperextended my arm 3 times trying it.