Then I will put all the girls that will be in the harem of the protagonist, it is not a definitive list, so it will surely be included more_
1 - Celeste Joy (OC).
2 - Roxanne (Hoenn Gym Leader)
3 - Verity (From the Pokémon Movie: I choose you!)
4 - Nancy (Female protagonist of Pokémon White and Black 2)
5 - Leaf (From Pokémon Leaf Green and Fire Red)
6 - Koharu (From Pokémon Journeys)
7 - Liko (From the new Anime of Pokémon but with an alternative story made by me)
8 - Iono (Palde Gym Leader)
9 - May (We know her perfectly)
10 - Dawn (We already know her)
11 - Serena (Obviously)
12 - Shauna (From Pokémon X and Y)
13 - Lillie (From Alola Region)
14 - Mallow (From Alola Region)
15 - Lana (From Alola Region)
16 - Cynthia (Ehem)
17 - Marnie (From Galar Region)
18 - Gloria (Female Protagonist of Pokemon Sword and Shield)
19 - Liza (Female Protagonist from Pokémon Black and White)
20 - Bianca (From the fifth Pokémon Movie)
21 - Sonia (From Galar Region)
22 - Erika (Kanto Gym Leader)
23 - Lusamine (Lillie's mother)
24 - Jasmine (Jotho Gym Leader)
25 - Whitney (Jotho Gym Leader)
26 - Lisia (Pokémon Idol)
27 - Acerola (From Alola Region)
28 - Korrina (Kalos Gym Leader)
29 - Liza (Hoenn Gym Leader)
30 - Nessa (Galar Gym Leader)
31 - Cheryl (From Sinnoh Region)
32 - Lyra (Female protagonist of Pokémon Heart Gold and Soul Silver)
33 - Crystal (Female protagonist of Pokémon Crystal)
34 - Suggest me more if you want a specific girl :)
*Note: The girls aren't in order.
Little sisters:
1 - Molly (From the third Pokémon Movie)
2 - Secret for the moment.