You can probably do some of the Kalos humans like you did with Erika, like, for example, idk: have Olympia deem you worthy once you've finished Valerie, Korrina and Viola's side scenes, that would be something.
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That's been my assumption also but along with that perhaps grouping some of the human girls together could work like instead of having Serene and Shauna be separate humans just stick em together. They are canonical friends so they could be hanging out together when you bump into them. Or my very subtle hint that a fivesome with the Flare scientists would be appreciated wink ;) nudge.
But its also clear that cuts need to be made due to the lack of Legendaries like even in your own example that's 3 out of 6 Pokemon unless one of those 3 have their own special requirement. Again, issue to be solved later Gen 6 is not anywhere near being developed we still have Gen 5 after Sinnoh
Yeah, it feels to me that one goal for this game is to represent the regions and the games within said regions, so having representatives of the evil team seem like requirements in my brain. The fact the Scientist girls are all similarly designed with that visor immediately said to me "oh you can do a large group scene with them."
Also while typing this comment I went and checked to see if you missed a villain team girl and found Ariana... god damn she hot. Funnily enough Gen 4 is when they gave her a name.