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Kanto pokemon lines that haven't had any additional forms or evolution stages since inception
>Fearow
>Arbok
>Nidoqueen/Nidoking
>Parasect
>Venomoth
>Golduck
>Victrebell
>Tentacruel(?)
>Dodrio
>Dewgong
>Cloyster
>Hypno
>Seaking
>Starmie
>Jynx
>Ditto
>Omastar
>Kabutops
>Dragonite
>Mew
>Fearow
>Arbok
>Nidoqueen/Nidoking
>Parasect
>Venomoth
>Golduck
>Victrebell
>Tentacruel(?)
>Dodrio
>Dewgong
>Cloyster
>Hypno
>Seaking
>Starmie
>Jynx
>Ditto
>Omastar
>Kabutops
>Dragonite
>Mew