I like the idea of this because realistically you don't need more than your STABs to break the vast majority of things, but given how insanely hard this thing hits, do you even need Swords Dance? I think Chansey is 2HKOed by Fire Punch after rocks regardless. This mon puts in so much work using only it's STABs that it might be one of the very few pokemon who has a different form of 4MSS: too MANY moveslots.
0 Atk Thick Club Marowak Fire Punch vs. 4 HP / 252+ Def Eviolite Chansey: 178-210 (27.7 - 32.7%) -- 86.1% chance to 3HKO after Stealth Rock
+2 0 Atk Thick Club Marowak Fire Punch vs. 4 HP / 252+ Def Eviolite Chansey: 355-418 (55.2 - 65.1%) -- guaranteed 2HKO
It does need Swords Dance if using Fire Punch. +0 Flare Blitz does 2HKO after rocks, but the recoil...