Ringuana [GRASS]
The Biter Pokemon
Ringuana are totally fixated by their own tails, and will waddle around with their tails in their mouths. Don't fight it, or they'll bite back.

Torusaur [GRASS]
The Toroid Pokemon
Torusaur's scaly hide renders it nearly impervious to attack. It hunts by asphyxiating prey trapped in its ring-shaped body.

Soroboros [GRASS/DRAGON]
The Infinity Pokemon
When a Soroboros gets old, its head will detach from its body and become a Ringuana. For this reason, scientists claim it is essentially immortal.