Well, there's not exactly a good reason, all I can think of is the fact that the king in their name is part of their name, not part of their gender.
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Dragon Type's And Ice Moves Like Dragonite Garchomp etc.
He doesn't evolve by leveling up. It's exactly like how you get a Kingdra. to get Kingdra you trade him or get him in a trade while he is holding a Dragon Scale. To get Steelix, trade him over and back or get him from a freind while he's holding a Metal Coat.
Kingdras weakness is Dragon. It also has very good special attack which is for moves like surf, dragon pulse and ice beam. That's a good moveset for Kingdra and also teach it dragon dance if you go to the move tutors house. Glad i could help:)!
Go to the daycare (located a bit beneath goldenrod city) and put in a ditto and a stage 2 Pokemon(like nidoking, empoleon, etc.) the just walk around and keep going back to the daycare, talking to the daycare man every time. at some point, he'll say your Pokemon had an egg so take it and hatch by walking around A LOT when it hatches you'll get the basic evolution of the Pokemon you put in (so if you put in nidoking you get the boy nidoran and if you put in empoleon you'll get a piplup. i hope i helped :3
any Pokemon that has the egg group dragon like: charmander and its eveloutions,ekans arbok horsea searda magikarp gyrados dratini dragon air dragonite kingdra treecko grovyle sceptile swablu altairia seviper feebas milotic bagon shelgon salamence gible gabite and garchomp.