Well there's a few new normal-type Pokémon introduced in Pokemon Black/White let's see what their like :).
Slaking in my opinion. Its pretty strong compared with the Pseudo Legends.
so i take it zangoose aint that good then?
There is not necessarily a strongest Normal type Pokémon as each one is used in different ways, no matter how similar. Some of the stronger Normal types include Blissey, Porygon-Z, Tauros, Togekiss, Ursaring and Zangoose (in each of their respective tiers).
EDIT: I suppose Slaking is decent too, as well as Chansey (in UU of course).