Glameow did not originate from fanon, and more information can be found on their respective wiki(s). You may read more about it on the following wiki(s):

Glameow are normal type fourth Generation Pokémon that evolves into Purugly at level 38. Glameow are gray feline Pokémon, with a vertically curled spring tail. It also crescent head with a sneaky face and two white tinted ears, a White muzzle, and a small black nose yellow eyes with a blue detail. It has white feet with pink paws. Their claws are sharp and their tail is fierce. They also have access to several elemental attacks. Their eyes are also capable of using hypnotic powers and are a popular choice of Team Galactic along with their evolution.