Pokemon designer Sugimori confirmed that Rhydon, Clefairy and Lapras were the first ever Pokemon ever designed and created for the game. They were designed first because the development team were focused on designing creatures to live alongside the human characters and by giving Pokemon helpful abilities such as carrying things around or sailing across the sea with people on their backs for the human characters.
Submitted By: 91210user
These also explains their hex code numbers in the code in Pokemon Red and Blue, thus clarifying that they were designed first depending on the hex code. Hex Code Number 01 being the first Pokemon ever to be designed and marked as Rhydon.
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