Dratini

Dratini were considered mythical Pokemon until recently, when a small colony was found living underwater. In "Ditto's Mysterious Mansion" Jessie, James and Meowth promise their Boss that they will capture Dratini, and prove that they are not failures. They attempt to steal Ditto — who can mimic Dratini — but are defeated by Ash and Pikachu. In the end, Team Rocket puts on a poorly made Dratini costume to try and fool The Boss!

First appearance: Ash has not yet encountered a Dratini