Due to some RL issues, I've been unable to update for a while (as you can tell), but those have largely been resolved - so I just had a mild case of writer's block (and concentrating on playing the US White). In fact, I've put 56 hours onto the game clock since the 6th, not even counting the time I've lost soft-resetting for what have you (usually non-sucky natures).
In fact, I managed to fill the entire Unova-dex last night, finishing with Hydreigon. And people are accusing me of having no life. Admittedly, that was true for the first few days, but that always happens with a hot new release.
But let's face facts:
1) If you catch everything possible in every area and explore the optional areas, you'll have a caught count of 100+ by the first credits. The second credits fill in about 15 more, and throw enough money at you that you can afford to buy full sets of vitamins to dope up Woobat and Swadloon for their happiness evolution. That takes about an hour per route/cave. (If you're going for Cryoganal, catch something at level 31 and use a Repel). This takes an hour a route and maybe 45 minutes for Cryo.
2) The GTS, despite having its share of L9 Reshiram requests, actually works decently well if you're throwing something up and making an offer. I was able to get both my Gothitelle and Mandibuzz by throwing up their counterpart - I got them in a half hour. Then the game speeds up breeding for foreign Pokemon, so...
3) As mentioned, the Lucky Egg does a LOT to speed things up. I wouldn't have been able to take Deino up to its final form without getting 6k experience in Audino punting.
4) Speaking of Audino... even in the late game you've got 3/4 odds of finding something that gives anywhere from 2k to 4k base experience in the low 40s. Vanilluxe certainly enjoyed it, at least. Generally, once something's in the late 30s it can survive to get KOs on the Route 12 Audinos (easiest to trigger since there's only one long patch of grass).
5) The new experience curve set up a situation where I got 10k experience for a freshly hatched L1 Pokemon while holding the Exp Share. Or 23 levels. I could probably do more if I had done it with the Elite 4. And now that I realize the Stadiums fill up quite dramatically post-credits - with L67 Pokemon and trainers who randomly hand you PP Max for no readily apparent reason, not that I'm complaining - there's a fresh source of Exp Share abuse daily.
6) I still have my import Black for Reshiram, Tornadus and trade evos + a second DS. That's all I used it for, though.
So add all that up, and yes - it's possible to complete a regional Pokedex in two weeks. Especially when you commute to work and have an hour lunch at said work.