It is very difficult, if possible, to fuse 2 Wormquakes... But I'm not sure about Rattlenoid...
it is pretty easy to fuse rattlenoid and serpentoid.anyways. im trying to find other bakugan to fuse...
but im thinking about trying to fuse my two new angelo/diablos.
You cant, it's immpossible. unless you switch one side with the other side.