There are 12 fully evolved Ground types available in BW2, so you can make 2 teams if you like:
Landorus- 600 Total Stats
Mamoswine- 530 Total Stats
Flygon- 520 Total Stats
Steelix- 510 Total Stats
Gliscor- 510 Total Stats
Krookodile- 509 Total Stats
Excadrill- 508 Total Stats
Claydol- 500 Total Stats
Seismitoad- 499 Total Stats
Golurk- 483 Total Stats
Camerupt- 460 Total Stats
Sandslash- 450 Total Stats
These are all rather powerful Pokemon, and even just 1 or 2 of them will give a Electric type trainer a mayor headache. I am not very skilled in Mono-type, and I will not try to make a team. But you should have no problem really. Use Earthquake and Earth Power and you should have no problem whatsoever.