Where are you in your Black or White playthrough?

[Blademaster]

Blade: You can get a Ducklett in one of the dark spots that appears on the Driftveil Drawbridge. Also, if you picked the Cover Fossil, you can get Tirtouga in Nacrene City.

Nay, I went for the Archaeopteryx because it's AWESOME.

Then, too, all three of the monkeys can be found in shaking grass in the depths of Pinwheel Forest, including the water-type Panpour.

Fuck that, those monkeys are ugly...

So I guess I'm gonna be doing some level grinding for awhile... Goddamn it.