Type Power Accuracy PP Priority Damage Target
Normal 70 100% 20 0 Physical Single non-user
Deals physical damage. Gains a 30% chance of causing an effect, depending on the terrain it is used in. These are as follows:
Building: Paralysis
Cave: Flinch
Grass: Sleep
Puddle: Lowers Speed 1 stage
Plain/Sand: Lowers Accuracy 1 stage
Water: Lowers Attack 1 stage
In Wi-Fi and simulator battles, the terrain is always assumed as "Plain/Sand". Although a physical move, this move does not make contact with the opponent.
Competitive Use
Secret Power has little competitive use. The chance to lower accuracy is also not a big draw, since doing so is an unreliable tactic. Dunsparce, Meloetta-P, and Sawsbuck are the only slighly viable users of this move, due to their Serene Grace abilities doubling the added effects chances to 60%, and dealing out STAB damage from it. However, as far as Sawsbuck is concerned, it definately has better things that it could be doing with the move slot.
Related Moves
Leaf Tornado is a slightly less powerful, less accurate, special attacking, Grass type move equivalent.
Mirror Shot is a slightly less powerful, less accurate, special attacking, Steel type move equivalent.
Mud Bomb is a slightly less powerful, less accurate, special attacking, Ground type move equivalent.
Muddy Water is a more powerful, less accurate, special attacking, Water type move equivalent.
Night Daze is a more powerful, less accurate, special attacking, Dark type move equivalent.
Octazooka is a slightly less powerful, less accurate, special attacking, Water type move equivalent, however, it has a 50% chance at it's added effect as oppossed to Secret Power's 30% chance.