Skarmory

Since it can be hatched from 10km egg i would guess it kinda is :)

It is a brave bird.

I think it isn't. I already caught 3 and transferred all to the professor.

I haven't seen any yet. I'd guess probably like Scyther or Pinsir, it is very rare except in places where it has more frequent spawns.

The Pinsir / Scyther / Electabuzz / Magmar of Gen 2. Comes out of 10k eggs and generates automatic cursing.