I'm personally a big fan of physically defensive Xatu, it works well with Empoleon, too. Just pack something to take tbolts and you have a good core. It's a competent wish passer, can take on Roserade/Hitmontop/Sableye/Hera, and is pretty cool overall.
I've recently been experimenting with a support/tank Golurk with SR/EQ/Ice Punch/Shadow Punch. I'm using Max HP/Atk adamant, but I might shift to a defensive spread. It's a very good poke vs. Mienshao and Heracross, for one, and is an all-around bulky and strong tank with great coverage provided you can predict well.