Answer:
They don't breathe O0O
Step-by-step explanation:
What's funny is that I realized most Pokemon are made of real things with different looks.
Pikachu is a mouse pokemon, but looks like a mouse and cat mixed
Anyways, the ones that are mimics of nonliving things, which don't breath, are most of the time the ones that are the most nonrealistic. For example; gible has no neck so the veins in a neck are in his body, and he's a mimic of a shark so he breathes through his body(gills), not his mouth. And with applin, well... applin is a mimic of apples, which don't breathe