Gen 9 is the first to not introduce a single non-starter Pokémon that has a 7 male to 1 female gender ratio.
>Gen 1
Fossils, Eevee(lutions), Snorlax
>Gen 2
Eeveelutions, Togepi/Togetic
>Gen 3
Fossils, Relicanth (also a fossil I guess)
>Gen 4
Fossils, Eeveelutions, Munchlax, Togekiss, Combee, Riolu/Lucario
>Gen 5
Fossils, Elemental monkeys, Zorua/Zoroark
>Gen 6
Fossils, Sylveon
>Gen 7
Salandit
>Gen 8
Kubfu/Urshifu