Huntail (same name in Japanese) is a Water type pokemon from the Hoenn region. Its origins comes from the deep sea fish the Gulper Eel, its name being a combination of Hunt or Hunter and Tail.
In the anime Huntail has appeard a few times, the first time it appeard was in the episode "The evolutionary war" in which a girl evolves her Clamperl into a Huntail. Another Huntail appeard in "Up close and personal".