You haven't seen Greencat's Pressure Deoxys-Speed in Uber battling, now have you? (Chubby v2.0 is scarier than his Clefable... trust me, I KNOW!) Things DO run out of PP faster than you think. I had my Pressure stalling Moltres take down Heatran one on one thanks to the stalling and all. Articuno helped me take down bulky waters because of pressure. Pressure DOES help, but not on stuff that are fragile like Aerodactyl (although Rock Head won't do him any better anyhow) and Absol. But Pressure is an interesting concept if you know how to take advantage of it.
As for levitate, I realized that most Pokes that do get Levitate would be WEAK to Ground moves without it. Gengar and Weezing comes into mind (along with Solrock, Lunatone and a whole bunch of others...)
Creative?! LOL! You're asking GAMEFREAK to be creative