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Off the top of my head, people would want at least
Jessie, James, Jenny and Nurse Joy from the show.
cynthia
flannery
lucy
candice
lorelei
Rosa
lusamine
skyla
Maybe Helda, Rosa, may, misty etc if you age them up.
If you can date pokemon, probably at least gardevoir, iron_valiant, or lilligant
If they all become human pokemons like monster girls, the sky would be the limit and the game would be a lot more interesting.
