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I'd say Thunder Wave, since your opponets speed drops greatly and 25% of the time he can't attack plus it last the whole battle unless the trainer uses an item to cure it
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Listen to shane please. Lanturn's special attack isn't that great so using one as an all-out special attacker isn't a good way to make use of this Pokemon. It should have both Thunder Wave and Confuse Ray to cripple the opponent and make it easier to kill. Keep Thunderbolt and Surf. Obviously, you're gonna be weak against Grass types, so keep a Grass counter in your team.
Also, don't forget Lanturn's Ground weakness as well.
EDIT: LOL something I noticed while doing my Battle Frontier research is that Lanturn is pretty much resistant to everything Brandon's (Battle Pyramid) second team can throw at you, with the exception of Moltres's Hyper Beam.
Also, a side set might use Rain Dance with Thunder and Surf/Hydro Pump, getting STAB from both and 100% Thunder and boosted Surf/Hydro Pump. Instead of Confuse Ray or Thunder Wave, you could use Rest, as Lanturn dies really fast to Toxic. These are alternatives to the set Shane gave you, and they actually work. Lanturn is really hard to counter, it's hell. Only Dusclops is worse...