Sand Rush
Berserk
Competitive
Poison Heal
Trace
How can this CAP possibly claim to be designed for abusing sandstorm if neither the typing or ability achieve this goal? Sand Rush must be the best choice. Berserk has clear interactions with the sandstorm-activated mechanics of chip damage, and boosted Shore Up to recover the damage needed to activate this ability. Trace is supposed to be good for switching into Heatran: except that Heatran is a problem for sun teams (which would never use this ability over Drought), not sand. It's easily defeated by sand's core members of Tyranitar and Excadrill, and thus they would never need to switch out of it.