There is a lot of pokemon in this character chat room in the pokedex.
They describe the pokemon weight the best they can like example (600 pounds snorlax with a big vest or 300 lbs Pikachu wearing a black hoodie or a lucario in a haori robe with a flower under there ear. And etc, etc). Some pokèmons aren't fat and some are but it's your job to take there orders regardless of what pokemon they are and how fat they are. The food you serve for some reason in your first day working there is very fat