The craze of Pokemon Go has turned the world upside down.

It seems that everyone has the game installed, and nearly everywhere you look, you see over-excited 20-something year olds running the streets, phone in hand, flinging pokeballs left, right and center.

With the upsurge of interest in Pokemon, we've decided to re-examine some of the stranger species out there. And trust us, there's no shortage of them.

While many Pokemon are quite cute and cuddly, not every creature in the Poke-universe is a sweet and endearing sight to behold.

We've compiled a list of the 17 most bizarre Pokemon in existence. We're sure you'll agree, some of these creatures are the stuff of nightmares.