Or are they all vegetarians or (hipster) vegans? Don't they need nourishment?! A seafood restaurant could servesomething like Claunchers, Magicarp, etc. You like poultry? Try a Torchic or a Psyduck. . . Land dweller food? Gogoa or Miltank. I think about this kind of stuff sometimes.
Several of Farfetch'd's Pokedex entries vaguely allude to it. That being said, it's pretty clear that real-world animals (or equivalent) do exist in the Pokemon world... The anime and TCG have shown (moreso early on, but still) real-world animals a few times. (Usually along the lines of generic fish or bugs.)
Don't know why I'm responding to this thread, though, given your obvious either sarcasm or lack of intelligence.