You might be able to find it if you browse Wikisaurus for awhile, but like I said, I can't spoil it. The name is half the joke. (Another part of the joke is because it's obviously a fakemon.)
Fun fact: Statswise, Fartfetch'd is actually about as strong as Pidgeotto/Staravia/Tranquill are. And where Kanto is concerned, it is indeed stronger than the Spearow you traded it for.