Well, the way I think of it a decent list is:
3/1-2-2/2 Beedrill (GE-RR-RR-GE/RR)
2-2 Claydol
1 Uxie LA
1 Azelf LA
16 Pokemon
The one in PokeChamp's article is sort of outdated, since it didn't really compete in today's meta.
My top candidates have come down to:
Legoes
Machamp (good build, though)
Mother Gengar
LuxApe
Flygon
Legoes, is, amazing! I mean, the extreme power locks possibly on your first turn totally ruins opposing Uxie, Claydol, Crobat G, and other decks along with a lot of Uxie for draw power, Azelf for prize checks, Crobat G for added damage, and any other instant play techs plus the ability to clear your bench (benifit) and your opponent's bench (benifit to you) is fantastic. Machamp has a decent chance only because SP's are popular, but the fact that he too is easy to play around and what happens if he can't pull a T1 donk ruins him. Only a good build would allow a Machamp player to go pretty far. Otherwise, I don't see so much in him. Gengar requires a decent build, but has a chance to win the Worlds. The fact that he can Shadow Room+Crobat G snipe down powers is what makes him pretty good. And a smart player would just play Gengar the way you would play any other deck. It's a 50/50 chance on Fainting Spell after all. Unown G also stops Gengar. Now comes to LuxApe, who really doesn't have so many bad matchups and can type trump many cards. He may be a tricky deck to play, but a good build can go far. Flygon is great, espicially with Weavile. Nothing much to say.