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Deals damage. Gains a 30% chance of causing an effect, depending on the terrain it is used in. These are as follows:
In Wi-Fi and simulator battles, the terrain is always assumed as "Plan/Sand." Although a physical move, this move does not make contact with the opponent.
Secret Power has little competitive use. The chance to lower accuracy is also not a big draw, since doing so is an unreliable tactic. The only slightly viable users of the move would be Normal-types, due to the fact hey receive STAB damage on it. However, as far as most of them are concerned, they definitely has better things that it could be doing with the moveslot.