003 = Serperior
If you chose Oshawott, your rival will have it, if you chose Tepig, you'll have to trade for it.
080 = Buneary
Found only in Black 2, in Castelia city. You'll have to trade for it.
109 = Rufflet
Found in route 23, can also be obtained by catching Braviary caught on Route 4 and breeding it.
111 = Vullaby
Found only in Black 2, in the same ares and methods as Rufflet. You'll have to trade for it.
152 = Zoroark
Evolve the Zorua that you got as a gift from the Ex-team plasma member, Rood.
232 = Shuckle
Found in Seaside cave as wild encounter while walking around, on the lowest floor.
244 = Sealeo
Found in Bubbling spots in the Undella Bay, can also be found be evolving Spheal.
249 = Ninetails
Found in Abundant Shrine rarely in Shaking spots of grass, can also be found by evolving the Vulpix found in the same area.
250 = Bronzor
Found in Abundant Shrine while walking in the normal grass.
251 = Bronzong
Found in Abundant Shrine while walking around in dark grass, also obtainable by evolving the Bronzor found on the same area.
265 = Seel
Found in the Giant Chasm and Seaside cave (any floor for both) while surfing.
266 = Dewgong
Found in the Giant Chasm and Seaside cave (any floor for both) while surfing on bubbling
288 = Tropius
Found in Route 18 in any grass.
Hope I helped!