I am making a sandstorm doubles team and am not sure if I want heavy slam to be boosted in power (Heavy metal) or if I should use rock head? Please list pros and cons of each.
Depends on your moves. Generally, I would say that Rock Head is better. Aggron gets several strong recoil moves and with no drawbacks, Head Smash becomes very powerful. Aggron is already super heavy and easily outsweighs many foes by 3-4 times.