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Deals damage. The damage dealt is based on the foe's weight:
Low Kick's variable Base Power is somewhat unreliable, but as there are many heavy Pokemon in the OU tier, this isn't as much of a problem as one might think. While accurate and powerful, Low Kick is outclassed by more reliable options, such as Close Combat and Hi Jump Kick.
Grass Knot is a special Grass-type equivalent.
Close Combat is a more reliable option as it has a set 120 Base Power, but it lowers the user's Defense and Special Defense by one stage.
Superpower is a more reliable option with 120 Base Power, but lowers the user's Attack and Defense by one stage.