Now that you bring up Mysterious Dungeon, I must question where they get all those gummies from. Is there a gummi factory out there somewhere? Do pokémon work the factory? This isn't even bringing into question how all these creatures' hunger can be perfectly satisfied by gelatin-based candy snacks with some fruit mixed in. Wait, what would the pokémon be getting the gelatin from to make gummies from? Are spoinks being butchered in those factories or something?
Maybe the Dungeon world isn't something which should be subject to much questioning period. Though this probably could be said about the entire pokémon world in general.
Unless if we believe the theory of normal animals live along w/ pokemon and humans. That can explain the gelatin.