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Gen 1 has a pretty shit dex desu. Aside from obvious shitters design wise, we have
>only 1 ghost type
>normal type out the ass
>every grass type is poison type save for the Paras family which has a completely shit typing
>No dark types
>psychic types having no hard counter (bug type mons and gengar get folded by Psychic)
These were eventually alleviated by Johto but Kanto has a severely limited dex and you're always going to end up having a Nidoking and/or Lapras at the end.