I'm wondering about the viability of trapping moves that do damage like Infestation, Whirlpool, Fire Spin, Sand Tomb, and Magma Storm. What are the best and/or most common users of these moves? The main reason I'm asking is Heatran's most used fire STAB move is Magma Storm, which is a pretty good trapping move, though 70 accuracy is pretty miserable.
Also, speaking of Heatran, would a set that's somehow based around Iron Defense and a Rocky Helmet be good? That's something Skarmory does. Heatran is a bit disadvantaged in this role by a 4x ground weakness, but power and ways to burn the opponent seem to make up for this. Maybe ID/ Lava Plume/ Toxic/ ?