so we have, the common Kingdra, the standard form that most Seadra take when exposed to a kings rock. many Seadra, however, can expose themselves to similar compounds out in the ocean, as it is not a totally uncommon material.
Maned Kingdra- a species I imagine to be more defensive in nature, stronger and tougher in armour with a gorgeous gold colouring that is sought after in the Kalos region.
Big-Bellied Kingdra - A silvery breed that yields excellent IV and EV breeds. extremely hard to produce via traditional breeding methods and usually found in the shallows of Hoenn, where the weather and climate are warmer.
Illuminated Leafy Kingdra - A highly sought after species of Kingdra that is famous for its contest-potential. Extravagantly finned and gorgeously coloured, its extreme rarity lends itself to its even greater power in battle. The Illuminated Leafy Kingdra is worshipped in some dragon-based cults due to its resemblance to older dragons from folklore.
Thorned Kingdra - an aggressive subspecies that usually breeds around kanto, known for its greater attacking power and speed, though, as with every other subset, rarer than its common counterpart.