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They could add in hunger, and if you let your Pokémon get too hungry, they die...... ok fine, they run away in search of food. If you overfeed them, they die... nah, they just become bloaty and sluggish.
Okay, so this would be stupid for them to do, and I’m sure everyone agrees... but seriously, they can eat leftovers all day long and never get sluggish or anything, nor do they ever run out of leftovers. How the hell does that even work? I guess I shouldn’t question logic in a world like Pokémon’s world.