Let's see, yeah Dusknoir does have crap HP, yet good Def and SpDf. Fire Punch, Ice Punch/Beam would easily kick SubSeed Sceptile's butt...I just threw it out there, I said it was an option. Sceptiles
do function better as Sweepers. I'm looking over Cradily now...
So, it's something like this:
Sandstorm Staller Cradily: Strategy - Chip off oppenents HP little by little, until it falls
@ Leftovers (Restores 1/16 HP every turn)
OR BrightPowder (Lowers foe's Accuracy slighty)
Bold Nature (+Def, -Att)
EV - HP 6, Def 252, SpDf 252 (MASSIVE defenses)
Toxic - Poison - PW 0 - AC 85 - PP 10 (Slowly devours the foe from the inside-out)
Sandstorm - Rock - PW 0 - AC AW - PP 10 (Damages non-Ground, Rock, and Steel Pokemon)
Amnesia - Psychic - PW 0 - AC AW - PP 30 (Raises SpDf two levels)
Barrier - Psychic - PW 0 - AC AW - PP 30 (Raises Def two levels)
The only thing that bothers me about this Cradily is that it can be shut down by any Steel type Pokemon, which there's, like, a
billion of, and
EVERYONE has at least one. With Suction Cups, it can't be switched out, I think...This is what I see comin':
SCENARIO:
Go, Cradily!
Go, Empoleon!
Cradily says "Oh ****, a Steel type! There goes my plan!"

Empoleon uses ICE BEAM! Bzzzzhooooomm!
Cradily decides to take it and get it over with, because it can't survive this onslaught!
That's my Empoleon, by the way.
So, Dyce: Just stick with the Sceptile Sweeper, no one's bagged on it yet, except someone wants to lower it's already-crappy Defense. WTF?
Find something you like, work with it to the best of your ability. Works for me every time.