Nice Article Kevin, I will try to build your deck and see how it goes compared to Uxie Double Donk. To some it might seem like the same deck, but there are a few big difference. I know the issues of my Double Donk deck.
UR DOUBLE DONK (Uxie Double Donk)
http://pokegym.net/forums/showthread.php?t=105043
Uxie basically is a first trainer turn DECK OUT. To accomplish this at the consistency rate that I can do it demands a very very tight list. 2 energy 1 Supportor and 1 tech pokemon bench spot, the deck can't go deck out with any more resources that get stuck in your hand before a uxie drop. And in the hands of a good player, the deck out can be done at about 85%-90%+ of the time with Full resources available to be used first turn. Thus for me, I can to do 80 damage to the active, plus about 60-90 damage anywhere I want first turn. If I drop 2 crobats, use 4 turns, hit 2 of 4 blowers, hit 1 SSU on a bat, that is 90. If I have some resources prized, or am just unlucky on flips, it is 60. Enough to get a bench basic donk, if I am really lucky, I can do 100 damage for the 2 bench donks plus the active for the triple donk. Now this Double Donk likelihood is majority of the time sort of thing. After the first turn, if my opponent is still alive, you are dependent on using the "Uxie Loop", where you are depended on the uxie "power" drop and replaying the energy, plus powers, and EX belt. The uxie loop get's the benefit of the Cyclone Energy option, where as shuppet can't use it.
Shuppet, it seems that a double donk, you do need to be lucky, because it doesn't seem like you would not be able to consistenly bring out all the resources to donk a bench and the active. Possible, yes, a lock the list does't seem like it? I really not sure until I get some play testing in. Now the positives seem that you can decide on which sort of "wall" you want to put up with your deck, meaning tomb or mime. It also seems like there is no lock to get 4 plus powers and expert belt onto shuppet. It seems you might catch a few early on, maybe even catch a pair of drawers, but consistently? My smell of your list would say probably not. But, you could probably build them as you go.
Now, something that I do give shuppet donk over uxie donk is in the SP match up. Assume you can fish out enough resources in the first trainer turn, you are better imune to power sprays mid to late game. When I play uxie donk against SP, the deck is crippled when a simple power spray is used. Assuming you have collected a few plus powers and an EX belt, you can still keep attacking.
Again, pokemon is about the getting to the right damage number, and right now, 80 and 90 damage per turn are really just about the the same in terms of KO a basic or 2 hit KO a evolved. I like the Mewtwo counter with Shuppet/Bannette, but having Uxie and Cyclone, and then Mime/Mime JR was just as effective counter. Another funny thing is that I never faced a deck that actually got Mewtwo out! Thus sometimes folks tech against imaginary issues. Bigger issues "faced" issues for my Uxie Decks where the Palkia Locks, Powersprays, Dialga's, and Flygon EX that got out. Now with Spiritomb, my perceived real issue is spirtombs itself. I think your Shuppet can deal with Spiritomb's better than uxie could. If you face a first turn Tomb, the shuppet could at the very least 2 hit ko it.
Regarding some of those match ups, I am not sure about those, it seems a bit overstated, especially gengar, and SP's.
Again, Fun League Deck, A Surprising Tournament Deck, I would even say a competitive Tournament deck, but neither my Uxie build or this Shuppet build I expect to be the BDIF unless it is extremely heavily played, and get's lucky. It is just too easy to counter. I think these decks actually could have had a chance to be the BDIF if spirtomb wasn't released.