I will critique it for you, and also items and abilities matter a lot too. Say you have a T-tar and a Heatran. The Heatran's investment of Ev's is 252 Hp, 126 Def and 126 SpD. It has a relaxed nature. T-tar can have any EV's/IV's/Nature, it doesn't matter, we just want to use his ability, Sandstream. Sandstorms up Steel/Rock and Ground types Special Defense making this Heatran ideal for sandstorm teams. It is quite bulky and it will let you set up, providing you don't run into a EQ Dugtrio. Give Heatran a Leftovers and he's a force to be reckoned with.