I would guess:
X
Zelda
Smash Bros

If it can't sell more then on the Smash week then never. Both PS4 and XboxOne will be pretty much be getting games on a weekly basis next year.

Yeah I think only a big Wii U release coinsided with a really weak X1 week would allow it. Once systems build up momentum and get a huge catelogue of must have games, even down weeks are still pretty solid (look at 3DS sales during software droughts). Even though its trailing behind PS4, I think Xbox 1 will reach that category by new years. 

I'm thinking 1 week in December when Smash is released in Japan and Europe, next year when the Wii U gets a price cut... Maybe X week if it launches worldwide same time and during a relatively quite period for X1. Zelda will probably be released in the holiday and have to compete with halo, cod etc.
 So I'm literally think only 2-3 weeks for the rest of this console generation

SSB week may be the best chance, even though 3ds version of the game will have a direct impact on that.

X probably won't released worldwide so its boost will be fragmented.

Zelda if targeted for holiday 2015 will probably clash with Halo or a mega third party release like The Division of something...

lol that's just wishful thinking and no thanks on the bet.  Obviously LBP3 will do that for PS4 but everyone already knows that

Wii U will outsell XBOX ONE for all week of December, and even first week of 2015.

Yes it may happen a lot next year and maybe the week Smash comes out this year.

Sorry but that not going to happen.  Xbox one is much stronger than Wii U in the US and everyone know the majority of the sales in december comes from US.

Smash week is the only week this year that they have a shot, and probably an outside one at that. Otherwise, they would have to line up a really strong release like Zelda with a really weak release from XB1 in order to get there next year.