It was too late to reply to this in the Fifth Gen Thread, but I did just wanna defend my point xD
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Only the 3rd generation counts for your point, as to make evolution of already existing pokemon, you need already existing pkemon, which there wasn't in the 1st generation.
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I was also using Second and Fourth Gen as part of the pattern. Obviously First Gen was totally unique, Second Gen added a lot of Evolution and pre-evolutions. Third Gen introduced a lot of new Pokemon and Fourth Gen again introduced many new evolutions and pre-evolutions.