I hate how often human gender roles are lazily slapped onto Pokemon. Whether it's the "male version has slightly larger body part" or "male version is physical/has higher offenses, female version is special/has higher defenses" (see: Nidoran, Lati@s, Indeedee, Basculegion) or "pink Fairy-types are locked to female" (seriously, does the dessert
really have to be gender locked?). I'm not saying that gender differences are
always bad (Wormadam/Mothim is based on an interesting biological phenomenon, though Mothim is boring in comparison to Wormadam), but there are a lot of cases where it's pretty silly.
But the following cases are probably the worst:
1) Female Heracross and Pikachu having heart-shaped body parts.
It just feels so glaringly artificial, whereas the male versions are "default".
2) Volbeat and Illumise.
Not only do they pull the "male version is physical, female version is special" thing, they also make Volbeat larger than Illumise (height of 0.7m vs 0.6m). In reality, female fireflies are generally larger than male fireflies.
3) Gallade being male-exclusive.
Despite not really having much that is gender-related in its design, it reinforces the association of Gardevoir being female. It's not really Game Freak's fault, but I think we all know it's contributed to the worst people on the Internet never shutting up about male Gardevoir.