Togetic is the first evolution of Togepi from the 2nd generation of pokemon. Togepi wears that shell so long, that it's not part of it's skin when it changes into Togetic. I like the design, but I don't think I ever evolved my Togepi. I think you had to evolve it with enough "happiness" or something like that... Emotions are hard to keep up with in video games.
I also didn't stay long enough in the Pokemon anime to see Misty's Togepi evolve. And then I hear she sets it free. How lame.