Well, Lucario is a physical/special sweeper, and Metagross is a big, bulky tank, thus serving very different purposes. But, my favorite is probably 'Gross, 1. because shiny Beldum/Metang/Metagross all look awesome and 2. because it's a walking supercomputer with giant metal arms that can (and probably will
) crush you into pulp...how can you not like a description like that? 
