Gonna bump this just because I had a similar thread idea but sine this is fairly recent I'll just use this instead.
Recently, I got back into Pokemon Colosseum and I was floored that they didn't make another one of these for the Wii. Honestly, this could be the killer app Wii U is looking for, and it shouldn't be withheld just because of the notion that mainline Pokemon games should stay exclusively on handhelds when we've seen the contrary occur with Colosseum and XD (even though they're regarded as spin-offs).
One of the main points developers back then had a problem with was working capturing wild Pokemon within a 3D space, which they worked around by having the trainer "snag" Pokemon instead. But now that Gamefreak is already working within a 3D space with X and Y, it really should be THAT much easier to transition to a console format.
Another worry was that a console game would cannibalize the handheld sales, to which I say "poppycock". They could treat this console version as the "third" installment that we're used to outside of last gen of the X and Y games, Pokemon Z. Or they could make it another spin off with different mechanics again and make Pokemon U, but I really don't want that again.
However, what I do want to see is this:
and have battles play out like in Pokemon Battle Revolution
except much closer to the targeted teaser released in 2005 rather than the poor Pokemon Stadium model rehash we got.
That is my dream.