There are only 16 evolution lines left from Kanto that have not received an evolution, pre-evolution, signature Z-move, or alternate form of any kind. Which will be next?

For reference, they are:
>Spearow line
>Ekans line
>Nidoran-F line
>Nidoran-M line
>Paras line
>Venonat line
>Psyduck line
>Tentacool line*
>Doduo line
>Seel line
>Shellder line
>Drowzee line
>Goldeen line
>Ditto
>Omanyte line
>Kabuto line