You people and your philosophical debates about an already confusing universe.
Well, Pikachu is an electric mouse, right? That's its species category. That hints to the fact that there are regular mice in this universe, so on and so forth. And when you read Pokedex entries, you may stumble upon some real-life mentions of places, like how Mew was discovered in the jungles of Guyana, or that Xatu has its own superstitious symbolism in South America, or that China reveres Arcanine.
And let's not forget Indian elephants.
My decision to include ants is my interpretation of this Gen XI move, Infestation, which is a Bug-type move, and its animation looks like ants or mites are invading the foe. I don't know what else would infest when Bug-type Pokemon are at least two-feet tall. And battle animations for Vespiquen's signature moves look like regular bees, so that was a part of it too.
There are regular animals. Even Zygarde 10% looks like a straight up Doberman, let's be real here.
But the question is whether or not these greatly personified Pokemon personalities here also raise real animals to eat. Regular fish seem to be no problem, since there have been mentions of salmon and eel and the like in games, but if you guys are talking about sushi, then you're not going to get a diner, which is more about American burgers and fries. You're going to get a sushi restaurant, instead.
So, American diner or sit-in sushi bar?