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If sandstorm is the prevailing weather condition, the wielder gets a 25% evasion increase. In addition, if a non-Ground-, Rock-, or Steel-type Pokemon has this ability, it will not take damage from sandstorm.
Sand Veil decreases the wild Pokemon encounter rate in areas with sandstorm by 50%.
Sand Veil is a very, very annoying ability that has generated a lot of hate in the past due to the fact that it was so easy to abuse. Even so, while you used to be able to see the occasional Gliscor with it, it usually prefers Poison Heal. No other users will be seen with it, apart from the occasional Cacturne, whom players use purely to annoy you. Thanks to the very high chance of avoiding an attack under sandstorm—a prevalent weather condition in most of Smogon's higher metagames—it is a very good ability indeed.
On October 15th 2012, Sand Veil was voted to be banned from Smogon's OU metagame as well as all tiers below it, so is currently unusable in all Smogon metagames bar Ubers and Little Cup.
Found in Dream World