Help with walk pokemon im new

I'm pretty sure that I should be able to evolve because I walked the 20km with this pokemon as a buddy ?

I might be wrong cus I'm pretty new

https://preview.redd.it/mcw4dimrswoh1.jpg?width=1080&format=pjpg&auto=webp&s=d38b274d97f4c3860bd74ff670e514ebd4a7de88