History

copyrighted quote from Bulbpedia
"Rumors of the so-called PokeGods are thought to have originated with Mew, the mysterious Pokemon about whom very little was known at the time. The lack of information led to speculation and rumors of how to obtain mew including the infamous truck rumour

Similar rumours circulated as new generation || Pokemon began to be revealed ( Marill in particular), resulting in fans declaring these new Pokemon to be PokeGods. Rumors spread of other Pokegods with no basis in fact as well; most were evolutions of a fully-evolved Pokemon, or different versions of existing Pokemon. Fake cheats and codes for obtaining these PokeGods in Red and Blue versions were widely distributed for years, even after the release of Gold and sliver"

more info?
Marill is more rumored to be the start of this looking like Pikachu. Making fans think this is a blue Pikachu.

there is many other Pokegods that will be put