>>40931858>>40932002Gardevoir looks more human, has her whole pokedex dedicated to how much she loves her trainer, and you get her first thing in the game. Medicham is less accessible, takes forever to evolve, and her body and face are generally less traditionally appealing.
I still like her but I understand why she isn't as popular as Gardevoir. What disappoints me though is that she's basically lost her Waifu status completely in recent years. Most people don't even put her in lists of Waifumon anymore.