Purloin, Liepard, Skitty, Delcatty = Meowth + Persian
Woobat-Swoobat=Zubat Golbat
Throh & Saw=Hitmons
Tirtouga-carascotta=Blastoise <--No
Pidove, Tranquill, Unfezant = Pidgey, Pidgeotto, Pidgeot, Starly, Staravia, Staraptor
Bouffalant = Tauros
Axew, Fraxure, Haxrous = Larvitar, Pupitar, Tyranitar
Roggenrola, Boldore, Gigalith = Geodude, Graveller, Golem
Timburr, Gurdurr, ConkeldurrMachop, = Mochoke, Machamp
Audino = Chansey
Klink, Klang, Klinklang = Magnemite, Magneton, Magnezone
Dwebble, Crustle = Krabby, Kingler, Corphish, Crawdaunt
Foongus, Amoongus = Voltorb, Electrode
Alomomola = Luvdisc
Blitzle, Zebstrika = Ponyta, Rapidash
and others that I cant be bothered to write...
@cautie they wanted Black and White to seem like a whole new experience like Red, Blue and green were at the time of their release
and in terms of pokemon seeming to be the same, they wanted to demonstrate that in the pokemon world as well as in the real world there is similarity as well as diversity.