Mine was a Zubat in Pokemon Red. It took me a while to get the hang of the whole catching thing, and consequently, I didn't bother trying it until I reached Mt. Moon. That said, I don't believe I ever used that Zubat, though I did nickname it. I pretty much did a solo run with Blastoise my first play through, and I'm not sure how many other Pokemon I bothered to use until I restarted my file sometime later. The original file should still be backed up on a Mega Memory Card somewhere, so perhaps I should look for it at some point.