>>50282374But humans have collarbones and they have them in the anime. Gardevoir only had a collarbone in a side game where most Pokémon looked different. The same studio who worked on Pokken also worked on New Pokémon Snap and updated the models which look in line with how it looks like an other media.
https://www.serebii.net/newpokemonsnap/photodex/gardevoir.shtmlThe animators are simply following how it's usually depicted.