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The wielder is unaffected by secondary effects of moves. This includes 100% occurrences, such as from DynamicPunch and Inferno. Shield Dust prevents the flinching effects of Stench, King's Rock, and Razor Fang, as well as the potential secondary effects from using Fling with certain items. It does not prevent effects from moves where the move is dedicated to that effect, such as Thunder Wave. It does not prevent secondary effects from moves used by this Pokemon, such as Close Combat and AncientPower.
This is actually a really good ability, but you cannot expect to see it very much when the five Pokemon that have it are Caterpie, Weedle, Venomoth, Wurmple, and Dustox. Venomoth is somewhat usable nowadays but would always much prefer Tinted Lens or Wonder Skin to Shield Dust. The other four are just awful, and this is a shame, because this ability could be really good on the right Pokemon.
Found in Dream World