I have been using Kingdra, and frankly I think Timid Specs is where its at. Let's face it, Kingdra's only use in OU is as an anti-metagame Pokemon. If you are using Kingdra, you are throwing something on your team to take down Ferrothorn (sunny day magnezone, lol) and calling it a day when it comes to rain teams, since Kingdra practically checkmates the whole team once Ferrothorn is out. So, imo, Kingdra doesn't need to bother setting up, or letting itself get whittled away by Life Orb as it tries (and often fails) to sweep. Nah... Kingdra just needs to conserve its strength for once Ferro down, and then sweep/destroy the entire Rain team. If he's not doing that (the enemy isn't using Politoed), he'll pull his wait just switching in as a "bulky water" a couple of times and blasting shit to pieces with his specs attacks (a typical wallbreaker). I think Timid Specs is the best set because you get the most power without compromising your health to try to set up or use LO for power (cause let's face it, Kingdra NEEDS some kind of boost to its power), AND you get to outrun and kill everyone who is trying to use Rain Dance Kingdra or some other mixed Kingdra. You ensure you outrun Cloyster in Rain too, who you'll destroy with Dragon Pulse. Or even rain surf for that matter... Just my opinions.