Sapusaur

Sapusaur, also known as Sapasaur, is a PokéGod. It was thought to be the evolved form of Venusaur.

Origin
Like many other Pokémon, Venusaur was thought to have another evolution. This led to the creation of Sapusaur.

Mist Stone
The mainly circulated way to obtain Sapusaur was through the use of a Mist Stone.