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My moveset is:
Chandelure w/ Leftovers
Hasty + Flash Fire
252 SpA/252 Spd/6 HP
Hex
Flamethrower
Energy Ball
Inferno
I like to abuse the burn from inferno with hex to get a nice stab.
Though I'd still prefer a well rounded Kingdra, Haxorus gets the job done. As soon as I evolved him, he was taking down foes 10-15 levels ahead of himself.