My favorite two pokemon are RayQuaza-1 Flygon-2. I love these pokemon so much because they both are flying types and Rayquaza is just a beast. Flygon always helps especially with hyper-beam. I used Flygon and Rayquaza all the way through my Emerald Pokemon game. GO Rayquaza and Flygon!!!
Flygon is Dragon/Ground. But I agree with you, both are awesome.
Also, Cofagrigus is a great physical wall. It's an even better WoWer than Dusclops.
Can anyone see Cofagrigus being a tank?
Blissey with evolite
Cofagrigus is a pretty good tank, but its moveset is pretty limited. I never really liked using the one I had EV trained. I wouldn't call its special defense "lackluster," though. A 105 base stat is pretty great. The only reason I can give for it being lackluster is in comparison to its amazing defense.