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A better question is why the fuck are so many of the items useless aside from evolving stuff. Kings rock, metal coat and deep sea scale/tooth all have uses outside of evolving, but then we have shit like reaper cloth, magmarizer, whipped dream, etc, where all they do is help the Pokemon evolve. You'd think magmarizer would boost fire moves or something based on the description, but nope. Completely useless outside of making butthead evolve into beavis