Garganator: Having 4 Taunters was actually not planned. For awhile Gligar and Skuntank were the only two with Taunt. However after a very bad encounter with a Dusclops carrying WoW, I decided I needed to do something to better fend off status.
This is what lead me to try out Raticate, who can absorb status, and as a lead totally shuts down Venomoth(TS also ruins my team). Grumpig was added simply because I decided to test him out in that slot. I knew he could use Substitute, but I decided I wanted to see how a fourth taunter worked.
Everyone else: Thanks for the great comments!