Ideas milling in my mind:
Pure Electric Physical Tank.
Sorry guys, but I really hate Togekiss and don't want to deal with neutrality to flying. Maybe with Motor Drive for some get up and go and lol Thunderwave. Magnezone's problem here is the weakness to Aura Sphere. We could even wrap this in with a Physical Tank Psychic, although I suppose complaints of weakness to EQ, Crunch, and Megahorn won't make it the envy of tanks (not that TTar would want to switch in if we gave it Cross Chop of Focus Punch or something).
The EQs, I don't know. If EQ didn't exist Drapion would be so much better. It would have to be a physical blissey to take EQs well.
Super-Defensive Fighter.
Yeah, I like Hariyama too, but he just doesn't have the right mix of stats and moves to be purely defensive. This also runs afoul of Togekiss, so it is rather backlot for now.
There's a lot of bulky fighters, and they're all good, I think this particular idea is a waste.
Rock Special Sweeper.
We'd need to give it something better than lol Power Gem, but it could be done.
This could be fun, I think it could take power gem, while getting a very nice movepool. Again though, if we create a pokemon to be destroyed by a garchomp's EQs, it would have to be a little more unusual. Still a fun idea.
Psychic Physical Sweeper:
Medicham/Gallade always struck me more as fighting with a psychic add-on. Psycho Cut and Zen Headbutt are both reasonably sound moves, and don't see much use.
Don't love this one, but it is decent. It should be pure psychic.