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To be honest I never bought the waifu/feminine angle. I think they can come out more sterotypically feminine, but that depends on inspiration for the base pokemon itself and cultural stereotypes for your area. I don't think it follows a pattern either. I think, since gen 2, they do try and cover their bases for preferences, but personslly I think it's better broken into:
1) sleek/elegant: this lends itself to more feminine traits but not always. Its focus is more on presentation, elegance and beauty. Can have an almost regal tone. Includes: Meganium, Sceptile, Empoleon, Serperior, Delphox, Primarina. My bet is on the Scorbunny line, and that it won't necessarily be "feminine" but sleek and haughty by its final stage.
2) cool/edgey: I think these tend to have the most "unisex" vibe to them, the focus is to make them look cool, interesting and/or daring. They often hit a ninja/assassin tone and come across as stealthy and/or wise. Includes: Typhlosion, Blaziken, Infernape, Samurott, Greninja, Decidueye. My bet for this gen is on the Scobble line with his little invisibility trick.
3) tank/brute: I think this one often comes across as the most masculine thanks to raw strength and power often being culturally associated with males. This one is about strength, brute force and tries to look powerful but also defensive. That bulky "tank" vibe and/or a more feral/monstrous vibe. Includes: Feraligatr, Swampert, Torterra, Emboar, Chesnaught, Incenaroar. My bet for this gen is the Grookey line to take this route and be very ape like at its final stage.