D-Boy: I call it "Catadriller". But go ahead and change the name if you find what its actual name is. Until then, this current name can serve as a sort of "placeholder".
I like the name, but the English name seems to be Tower Robot. I don't have a Japanese name to check the accuracy of the name Tower Bot. I wish Catadriller was the name for Catter-Killer.
Mega Man Network says its called Big Pets.