Metagross has far better stats besides Defense and can actually stomach super effective hits. Head Smash does not a good Pokémon make; otherwise Aggron, Rampardos, and Archeops would actually be known quantities in OU. They are not, despite my deepest wishes that Archeops would get Rock Head and Brave Bird in BW2. Okay, I'm going to be honest and say I don't know why I replied to this post. Like, I get that Metagross is "bad" outside extreme niche conditions which he just so happens to fulfill in my team. But Aggron?