Kanto
>Calens, Green's ancestor
Johto
>Sanqua, Karen's ancestor
Hoenn
>Beni, Wally's ancestor
Unova
>Lian, Clay's ancestor
Kalos
>Gaeric, Wulfric's ancestor
Alola
>Calaba? Mina ancestor?
Galar
>Laventon? Leon's ancestor?
Every region have one character's ancestor, Charm doesn't count because she's also Bertha's ancestor and Alder's, Maxie's and Archie's doesn't appear in the game. Ingo is just Ingo.