Kingdra 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):

#230 Kingdra
Image from the Generation IV games
Category Dragon Pokémon
National Dex Nr. #230
Generation 2
Pokémon Color Blue
First Appearance Pokémon Gold And Silver
Latest Appearance Pokémon Omega Ruby and Alpha Sapphire
Type(s) Water/Dragon
Ability/ies Swift Swim, Sniper
(Hidden: Damp)
Average Height 5'11″
Average Weight 335.1 lbs.
Evolves From Seadra
Evolves Into N/A