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While being tied for both weaknesses and most types that resist it sucks, it is kinda carried by having two of the best statuses in its possession (with an immunity to both to boot) and what resistances it does have are pretty choice. Making the knees of stuff of stuff like Gastrodon buckle is nothing to scoff at.
I digress here, but I find it funny how the worst performing Grass/Fighting type is the Legendary one.