So, dusknoir with abomasnow and cresselia?
Gotcha.
Ding, ding, ding, ding. We have a winner.
But in all seriousness, Abomasnow or Snowman as I like to call him cause Abonasnow really helps in the Kingdra match-up as your it takes away the swarming 60/20 and reduces it to just 40. One option that Kingdra still has is that it can build up an Upstream and make it so that the 3HKO is reduced to 2HKOs maybe even OHKOs but every unlikely.
I know people will argue that it doesn't hit any of the bench Kingdra line but it still does hit the Claydol. Then it's only doing 40 per turn with 1 Cresselia Lv.X in play which I can almost always T3 sometimes T4 if I'm not having the greatest start. So the 40 that it does is actually reduced to 30 with Moonlight Dance. In the mean time your setting another Snowman or a Dusknoir, AND hitting their Kingdra for 20 and Claydol for 20. If they have any other techs that aren't Water or Grass those obvious get hit as well.
Like I said I completely destroyed an un-teched Kingdra, but now I'm going to change the list so that it's teched against Kingdra. I expect the match to be closer but still for CAD to pull it out in the end as the same thing happened with in the Torttile match-up. First Torttile wasn't teched for Dusknoir and only managed to take 2 prizes. Then it was teched for Dusknoir but could only win about 30% of games, and almost all games going down to 2-2 or 1-1 prizes. You must remember that anything Kingdra techs in for Dusknoir it losses consistency, so that's what Snowman takes advantage. I compare the two decks vs. CAD because the Snowman doesn't hit any other bench for 20 besides the Claydol, and the active, not including techs.
I'll get you started on a list just so your match-ups are a little more accurate.
Pokemon: 25
3 Duskull (SW, Reaper Cloth best one because of the speed and consistency it gives the deck)
1 Duskull SF/SH(for the energy less attack which I know will really help every now and then)
2 Dusclops D/P (for it's capabilities of spread, even if it flips tails it can self damage and then do more damage with Dusknoir's Damage Even)
1 Dusclops S/F (Dark-eye, it's good to have a one energy attack and something that can disrupt, especially if you start with Duskull and hit heads on it's astonish)
2 Dusknoir S/F (Damage Even, best Dusknoir to spread with)
1 Dusknoir D/P (Might take it out to add a Promo or 3rd Damage Even if Magmortar and AMU still give you a hard time)
1 Dusknoir Lv. X
2 Snover MT (60 HP=No Sableye Donkage, Curiosity is nice for no energy)
2 Abomasnow SF (one of the best side-kicks Dusknoir can have, if not the best because of it's ability to prevent damage to all your Pokemon, not just active, and obviously the spread, Water type could help against Magmorat or any other fire deck like Infernape)
2 Cresselia (Future Sight, again this helps the consistency of the deck more ways then you could imagine)
2 Cresselia Lv.X (we all know why the card is here, and with all the spread you could even take 2 prizes with it's attack if you can power it up on the bench)
2-2 Claydol
1 Unown G
1 Unown Q (for free retreat on your Cresslia, it helps get the first one out much quicker and not having to miss an energy drop or for it to keep it's energy and scare your opponent by dropping another energy onto it)
Supporters: 10
3 Bebe's Search
3 Roseanne's Research
2 Rowan
2 Wager
Trainers: 12
1 Luxury Ball
1 Night Maintenance
2 Warp Point
4 Dusk Ball
2 Rare Candy (only 2 since you play Reaper Cloth Duskull and 3 Dusclops, you could switch to 3 and drop a Dusclops, but still don't drop Reaper Cloth Dusknull)
2 Premier Ball
Energy: 13
4 Call Energy
8 Psychic
1 Water (it actually helped me 4 out of the 10 games I played at Jimmy's Cash Money Tournament, so I would still run it)