I was about to post a CB Kingdra edit, but then I found MetaNite's set in this thread. However that set involved 2 Special Attacks/Toxic and seemed focused on Rain Teams. This CB Kingdra set is a bit different in terms of EVs and attacks (although not by much); his set outspeeds Jolly TTar, while this one outspeeds 252 Adamant Gyara. I'll just write it up here instead of creating a new thread.
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http://www.smogon.com/dp/pokemon/kingdra
[SET]
name: Choice Band
move 1: Waterfall
move 2: Outrage
move 3: Hydro Pump
move 4: Return / Sleep Talk
item: Choice Band
nature: Naughty
EVs: 252 Atk / 34 SpA / 224 Spe
[SET COMMENTS]
<p>This set trades the sweeping potential of Dragon Dance for immediate power in the form of Choice Band. Sporting 475 Attack with Choice Band equipped, Kingdra can deal serious damage to mostly any switch-in by virtue of its high powered STAB moves. Outrage will 2HKO Celebi, Vaporeon, and Swampert (provided Stealth Rock is in play). Waterfall serves as your weapon against Tyranitar and Heatran; most importantly, it couples very well with Outrage to afford Kingdra phenomenal attacking coverage. With 34 Special Attack EVs, you can 2HKO 252 HP/0 SpDef Skarmory and Forretress with Hydro Pump; this is significant because both Pokemon take little damage from Waterfall. It is also your strongest move against 252 HP/0 SpDef Metagross, who takes 42% on average. There are admittedly few options for the final slot. Return is your best bet to damage Water-types without locking yourself into Outrage; as such it deals 35% on average to 188 HP/252 Def Vaporeon and 31% to 240 HP/216 Def Swampert (although you're better off using Waterfall against the latter). Sleep Talk is another option, as it allows Kingdra to deal damage even while asleep. This recommendation, however, comes with a warning: Sleep Talk will fail after one use, thanks to Choice Band.</p>
<p>The EV spread is relatively straightforward. A Naughty nature with 252 Attack EVs allows Kingdra to score crucial 2HKOs against Swampert and Vaporeon with Outrage. 34 Special Attack EVs allow for Skarmory and Forretress to fall in two hits thanks to Hydro Pump. 224 Speed EVs allow Kingdra to outpace Adamant Gyarados by a point.</p>