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.