A good Kingdra list IMO is something like this:
4-2-4 Kingdra(3 Prime, 1 LA)
2-2 Donphan(type coverage and to put a hurtin' on Luxray)
2 Crobat G(more pain for opponent)
2 Uxie(Lv. X if you can get it...I can't)
1 Frosslass GL(to drag up Vileplume)
1 Regice(to move Tomb)
T/S/S:
4 Poketurn
4 Cyrus
2 PONT
2 Judge
3 Bebe
2 Junk Arm
3 Collector
Something like that. I'm currently making a skeleton for my future Kingdra list, and it may include those cards in one form or another.