I'm completely new to any sort of competitive battling and if you gentlemen could be so kind I'd like advice.

Doing some research, I think I want to build some sort of sandstorm stall. However at the moment I'm just trying to get three guys to battle with friends.

Currently I have...

Aegislash w/ leftovers | Brave
~Swords Dance
~King's Shield
~Shadow Sneak
~Sacred Sword

Gliscor [Poison Heal] w/Poison Orb | Impish
~Toxic
~Protect
~Substitute
~Earthquake

What would make a good third guy? What I should get after that also appreciated.