So guys, I'm working on a space themed team.

So far, it will consist of Starmie, Solrock, Lunatone, Beheeyem, and Magnezone. I'm still working on the movesets, natures, and all that shit.
Who do you think would make a good final member? I'm mostly trying to avoid using any pre-evos of pokemon already in the crew.

On that note, any theme teams you guys working on?