>>56903161>They stopped doing gender differences right after the gen that introduced them, anonOfficially introduced in G4 (G1 had a prototype example with Nidoran, and G3 with Volbeat and Illumise)
G5: Unfezant, Jellicent line
G6: Pyroar, Meowstic
G8: Indeedee, Basculegion, Eevee*
G9: Oinkologne
Just like babies and fossils, they are features that remain in the franchise, only to a lesser extent, this will happen with the regional, convergent ones, at some point we will have so many gimmicks that each new region will only have 1-2 examples to make room for the new gimmick of the moment.