7. Spoink
What is it: It is a pig Pokémon head on a spring, which is a Psychic type native to the Hoenn region.
Why it is creepy: Did you not read its description? A pig head on a spring! Actually it gets worse. The Pokédex for its Ruby entry reads: "Spoink bounces around on its tail. The shock of bouncing makes its heart pump. As a result this Pokémon cannot afford to stop bouncing - if it stops, its heart will stop." That right there is messed up. Other Pokédex entries state it bounces whilst sleeping. I should think so if that is what it has to do to stay alive!