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Baby pokemon and 90% of early region shitmons.
You've got a bunch of these cute and weak little blobs that would be perfect to fill your early game team with, but instead they're almost impossible to find in the wild and GF/TPCi/whomever would rather start each new gen with a normal type rodent or a normal/flying bird. They threw us a bone with Corviknight and Orbeetle but we'll have to wait and see if they drop the ball in gen 9 and give us shitmons again.