Funny how soo many users use combo as requirement. I mean, a 6-combo could do more damage than a 10-combo. I usually want max combo, but not a set amount of combo... My water team does the most damage via combo in my server, an it's only a 6-combo (one chase each + summon + mystery)
Anyway, I have never used, but the powerful Earth users I see are using Pains.
The best lineup I've seen so far is :
X - Main - X
X - Ningendo - X
Konan - Gakido - X
Using Super Lightened Boulder, Petrifying, Primary Lotus, Pose of Duel, Steel Body and Rhino, which does one hell of a big combo
The other one who's not bad uses :
Tobi - Main - X
Jigokudo - Shurado - X
X - X - X
Using Super Stone Fist, Petrifying, Stone Fist, Bottom Force, Steel Body and Katsuyu