Unpopular opinion, but I'd actually love a split evolution that depends on game version, or just the same final stage evolution but the form is different depending on the version. I'd love it if one was a more "feral" form, monster/beast, and thrbither could be more humanoid/bipedal. I think this way it would be easier to hit even one design someone likes and cater to different styles. I'm honestly sick of the bipedal/humanoid starters, I want to see monsters again. Even pokemon like Blastoise and Feraligatr though bipedal still feel more "monster"ish than the recent trend.
I actually don't think they purposefully do a more "feminine" one, I think its intention is for like a "sleek, elegant" design and that often translates to feminine because of gender stereotypes. Primarina is feminine in design for sure, I mean she's based off a siren/mermaid which is sterotypically female, but I don't think Delphox is overly feminine, and neither is Serperior. They tend to do a more sleek, elegant design which people often label "waifu bait", a cool/edgy design like Greninga, Decidueye, Samurott and a tank/heavy design like Incenaroar, Chesnaught and Emboar.