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You say most of this only focusing on the Pokémon that went from good to great when instead you should be think of the real reason the split was put in place. It was to help Pokémon go from fuck awful to half decent, the split limited the variety between Pokémon being special or physical. If you were a grass type you better be specially invested or you're FUCKED. Pokémon like Crawdaunt, Sharpedo, Kingler, Hitmonchan and the like were all GARBAGE before the split, some listed suffered greater than others, as their typing/movepool actively worked against their stat distribution. Sure these Pokémon weren't turned into competitive gods for the most part after the split, but having Sharpedo be able to use its attack stat for STAB moves is infinitely better than hitting opponents with sub 100 STAB in RSE.