grass knot good move

[Psyduck]

is grass knot good move for pokemon

[Zidarose]

Grass Knot is a suprisingly good move, but it is somewhat fickle, as most of its damage is determined by the weight of the opposing Pokemon. It does receive the standard bonuses from same type and weakness, but the more the target pokemon weighs, the more damage it will do (watchout Snorlax!)