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Because Gamefreak has this mindset that Grass types should be support and defensive inclined instead of offensive. And it really doesn't help when they make sweepers like Serperior and Lilligant but decide to give them non existent coverage like most mono-grass.
Gen 7 revamping Nature Power to automatically turn into Earth Power would be a miracle for all grass types that learn it, and other pokemon begging for ground coverage(Florges)
