I ran almost this, only with a Focus Sash over the White Herb and Ice Shard over Razor Shell. (I wanted it as a Talonflame-Landorus-Therian answer that had other uses, was the initial impetus) It hits really hard, enough so that it can put a lot of pressure on Unaware Suicune that expect to casually take it apart but far too many things can inflict serious damage on it before a Shell Smash, let alone after, and the meta leans sufficiently towards bulky/stall-y that it can rarely pull off the full sweep, especially since more offensive teams will often have an Extreme Speeder of some kind to kill it even through an Ice Shard.Kabutops @ White Herb
Ability: Skill Link
EVs: 88 HP / 252 Atk / 168 Spe
Adamant Nature
- Shell Smash
- Razor Shell
- Rock Blast
- Icicle Spear
Hoo boy. This thing is insane. Between its nice typing and surprising bulk, it's relatively resistant to revenge killing (it takes less than 70% from Lando-T's 252+ CB Brave Bird). This gives it a circumstantial advantage versus other Shell Smashers like Gyarados-Mega, which gets smashed by BB or Pixispeed. Meanwhile, its excellent coverage and power mean that it can manhandle offense once set up. Thanks to its STAB on Rock Blast, it can even do a number on stall. After a smash, it 2HKO's Intimidate Suicune after SR! FYI, the EV's are tailored to outspeed CS Adamant Terrakion while maintaining as much bulk as possible (and, of course, an odd HP number).
Upon further thought Terrakion running this would probably perform a lot better, even with no STAB on Razor Shell. It's faster (And therefore can invest less into Speed because Shell Smash), bulkier, has more base attack and has a somewhat more useful typing. I suspect in practice it would still be underwhelming, though, as stall will just have good Unaware choices and offense will probably pack Extreme Speeders.