Where can I buy stat boosting items in Black or White?

Question

I need them so I can get my Tyrouge to evolve into a Hitmotop.

Answer 1

battle subway for 1 BP each and in the 9th route in the big store

Answer 2

on the route 9 shopping mall and the battle subway. also, if you want a HITMONTOP then wait for a swarm of tykrouge, level 'em up and at least 1 will be a HITMONTOP(probly).