Well, orginally this was an effort for both Sharpedo AND Crawdaunt, however, I found the Sharpedo one to be less effective, as even NVE moves were leaving pretty big dents in it. Losing 50% of your HP switching into fairly weak attacks was devestating. I couldn't even Wish pass to it because usually the NVE attack + Stealth Rock damage outweighed the Wish Pass.
Here is an example of the difference in defensive prowess:
Blastoise's Surf against Crawdaunt: 29.74%-35.32%
Blastoise's Surf against Sharpedo: 35.23%-41.64%
And that's on the special side. Here is an example of a physical attack. Adamant Banette's Shadow Claw:
Shadow Claw on Crawdaunt: 23.42%-27.88%
Shadow Claw on Sharpedo: 41.28%-48.75%
I also couldn't think of any real threats that Sharpedo could outrun and kill better than Crawdaunt could. There isn't very many pokemon hovering around the 289> mark that Sharpedo could feasibly take on. Anyways, I suppose I could dig up the original post. It'll be hard to find though.
I suppose Sharpedo would have an easier time "sweeping" with it's higher Speed stat, but with all the revenge killers (scarfers, hitmontop, aerodactyl, etc) I would rather have more switch-in oppurtunities than speed. This set is designed to break walls anyways, not defeat other sweepers, although many of them can be killed on the switch if you predict well.
8/32/0 Rash Crawdaunt
Crawdaunt's Defense Tier: 114.41
Crawdaunt's Spc. Def Tier: 109.41
32/0/0 Rash Sharpedo
Sharpedo's Defense Tier: 108.81
Sharpedo's Spc. Def Tier: 107.77
So Sharpedo's defense is lower than Totodile's... and Crawdaunt's is on par with Charizard's. On the special side there is only about a 15% difference though :P