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While sandstorm is the prevailing weather condition, the Base Power of Ground-, Rock-, and Steel-type moves is multiplied by 5325/4096 (about 130%). In addition, if a non-Ground-, Rock-, or Steel-type Pokemon has this ability, it will not take damage from sandstorm.
All of the Pokemon that obtain this ability already are immune to sandstorm damage (bar Shellos). Gigalith is the only Pokemon that doesn't obtain another very good alternative ability; Excadrill has Sand Rush, Probopass has Magnet Pull, Hippowdon has Sand Stream, Gastrodon has Storm Drain, Dugtrio has Arena Trap, and Landorus has Sheer Force from the Dream World. Landorus is the only really common user of the move to power up its STAB Earthquake as well as Stone Edge, since it is the only one naturally fast enough to make use of the power. Excadrill can also make use of it on non-sweeping sets, if you are not too bothered about the massive loss in Speed from not using Sand Rush.
Found in Dream World