Hello Nilesh,
It is my understanding that you are trying to use pcregistericp function to register a moving point cloud to a fixed point cloud.
For improving your registration output, you may also explore different Name-Value Arguments of “pcregistericp” function like Metric, MaxIteration, InitialTransform, etc.
You may also refer other registration algorithms available in MATLAB like pcregisterndt, pcregistercorr, and pcregistercpd.
I hope it helps you.