Grass Knot (Japanese: くさむすびGrass Knot) is a damage-dealing Grass-typemove introduced in Generation IV that deals varying damage. It shares the same mechanic as the move Low Kick. It has been TM86 since Generation IV.
Grass Knot doesn't have a standard base power; rather, its damage is calculated based on the weight of the target. Grass Knot's power is calculated as follows (note that the game uses weight in kilograms instead of pounds for all the cutoffs).
Weepinbell's eyes glow light green. Then, two green-glowing vines grow out of the ground near the opponent's feet and tie themselves into a knot, causing the opponent to trip. Weepinbell can also make the vines grab an airborne opponent and slam it into the ground.
Roserade stares at a patch of grass by the opponent's feet. Suddenly, two bunches of grass fold toward each other. When the tips touch, they wrap around each other and the opponent trips over the tied grass.