Now that drizzle-swift swim is out, dragon dance is needed to fix kingdras speed. And like mentioned above, outrage and waterfall are decent enough.
On the other hand, Kingdra is a great weather counter. He x4 resists water to counter rain teams and x4 resists fire to counter sun teams. Also, there's no rule to stop you using swift swim if your oponent puts up rain.
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Kingdra has Waterfall and Outrage as pretty good physical attacks. Add dragon dance with that and you have quite a deadly force imo. Another option is making it a mixed sweeper, which is pretty nice as well. I haven't really used kingdra all that much yet, still quite new to competitive play, but that's probably what I'd go for seeing its movepool. o.o
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