Guys, sexual dimorphism is when the males and females of a given species have distinct characteristics; Nidoking and Nidoqueen would be an example of sexual dimorphism; Pikachu isn't changing sexes here, she's evolving.
Edit: having read the wiki for the tag, I still stand by my previous statement, but I also want to add that I feel that the tag really ought to be used when showcasing the differences between sexes, not just when a gender-specific characteristic is visible on a single character.
If you want to tag female pikachus, I feel like that should be an explicit tag, if anything (though definitely something that should be brought up in the forum before anything is decided).
