Well, the ones that eat and drink do. Pokémon that get sustenance from energy or electricity, such as the porygon line and voltorb line, have no need for it.

If you don’t mind me saying so, anonymous, it’s odd that you wouldn’t know about this. This is a well-known fact, and some evolution lines are even famous for it. For example, it’s common knowledge that dusk stones are nothing more than sableye fecal matter, and it’s said that geodude are responsible for the rest.