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The wielder's stats cannot be lowered. It does not prevent self-inflicted stat drops, such as the Speed drop from Curse or the Attack and Defense drop from Superpower. It also does not block the effects of Haze, Heart Swap, Guard Swap, or Power Swap.
When the wielder is first in the party, wild encounters have a lower chance of occurring.
As only two Pokemon have it, Heatmor and Torkoal, it will naturally be limited to seeing a very small amount of use. However, it doesn't prevent self stat reduction, so does not have any effect on Shell Smash Torkoal, unfortunately.
Found in Dream World