I hope the game doesn't have a small number of cities as it will be based on the Iberian Peninsula, which is a large region compared to most of the previous regions, as well as having many different cultures.

Here is the number of all sites and settlements in the Pokémon by region:

Alola - 9
Galar - 12
Hoenn - 16
Johto - 12 (including Frontier Access and Safari Zone Gate)
Kalos - 16
Kanto - 10
Sevii Islands - 7 islands
Sinnoh - 17
Unova - 20 (including Black City and White Forest)