The reason Gen 2 introduced Dark-type and Steel-type was to balance out the Psychic-type and for people to use more of the underused Fighting-type.
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Everything Pokémon: Pokémon Facts Book 1
RandomHello and Welcome to "Everything Pokémon!" I have tried my best to differentiate myself from the other Pokémon Fact Books to bring a whole new and fun experience for the reader. Hopefully you will enjoy the many things I have done to make this book...
Pokemon Fact #98
The reason Gen 2 introduced Dark-type and Steel-type was to balance out the Psychic-type and for people to use more of the underused Fighting-type.