SpartanMalice
Y'all jokers must be crazy
I just realized Luke has Bone Rush, it has poor accuracy but he could technically swap it with Cloyster who still has good defense. It's a quite gimmicky option though.
Don't forget that you can juggle abilities around within your team. My example earlier was Heatran, Ferrothorn, and Cresselia, with Heatran getting Levitate, Ferro taking Flash Fire, and Cress getting Iron Barbs.Who wants Sand Stream? Aerodactyl? Rhydon/Rhyperior? Regirock? Shuckle?? Rampardos?
That lets you choose from Rock Head, Solid Rock, and Sturdy but also some more unconventional abilities like Gluttony and Clear Body.
T-tar would love Solid Rock. A bulky Dragon Dance set with that... umph! Or, as mentioned above, it could snag Sheer Force from something like Rampardos but Rampardos just kinda sucks and would probably like Sand Force over Sand Stream.
Solid Rock
Sand Stream
Sand Force
Sheer Force (technically it traded its own Sand Force for Rampardos' Sheer Force. Is that legal?)
Serene Grace
Levitate (They can they keep their original abilities, right?)
Technician Mamoswine, Thick Fat Dragonite, Multiscale Gyarados, Moxie Conkeldurr and Guts Terrakion. I reckon these could cause serious damage on a hyper-offensive team, maybe with the sixth member being a supporter / dual screener like Espeon.