The origins of Pokémon... Capsule Monsters

Capsule Monsters was the initial concept by Satoshi Taijiri that ended up as Pokémon, an idea that started long before the release of the games a day like today, in 1996. As early as 1990 Taijiri was pitching his カプセルモンスター  to Nintendo, with sketches like these, which offer a glimpse into the original form of what became Pokémon.

We can even see some of the earliest designs, creatures like look pretty much like the final forms of monsters like Staryu, Rhydon, Blastoise, Gastly, Nidorino and Slowbro.
They should totally make a documentary on this!