Genjuu Souseiki (aka Mythical Beast Genesis or Genesis Phantom Beast) is a cancelled RPG that was in development in 1990 by Nihon Bussan / Nichibutsu for the Famicom / NES. It seems that players would have took the role of a god, fighting with other gods to conquer more areas of the world, using the power of monsters that were able to evolve like in Pokemon. Only few screens and some info can be found in a japanese website.
Thanks to Celine for the contribution!
U64 is an archive with articles, screens and videos for cancelled, beta & unseen videogames. Every change & cut creates a different gaming experience: we would like to save some documents about this evolution for curiosity, historic and artistic preservation.