I could argue that Scyther was one of the coolest Pokemon from Generation I, and had one of the best designs overall. When Generation II rolled around I learned I could evolve it with a Metal Coat, and I was instantly mesmerized by the sheer awesomeness that is Scizor.
Like I mentioned during my Torterra post, I periodically swap these two out on my main team. Scizor has zero problem fitting in with the rest, and hits hard and fast.
In Generation VI Scizor received a Mega evolution, and while I'm not horribly fond of it, it was cool that they thought he was good enough to get one.
This thing just looks like it could tear you apart. I'd hate to be on the receiving end of those pincers.