Well Jrrrrrrr, the thing is, I personally would be content with HP Water as the only option, but Aldaron says I should have as many viable options as possible. This is because the last slot depends on the other team members. If you can take out Gengar, but Metagross gives your team problems, Hidden Power Ground could be used... if Tyranitar is a major problem, use Hidden Power Fighting, if you need to take down Dusknoir or something (lol) you could use Dark Pulse.
Because there is no way to get maximum Speed with Hidden Power fighting, I scrapped it. Tying with Scarftran, one of the few faster pokemon you can set up on, is a bad thing. You can squeeze a Salac and a Sub, or a Salac and a Plot out of it if it switches in as a you used Substitute.
Thunderbolt is, as you said, pretty "meh" but it got a lot of neutrality so before I brainstormed Hidden Power Water, I was using it, as it hit a lot of the steel pokemon for neutral.