Best way to Evolve Riolu in Pokemon White?

I had the exact same problem!, here is what you do, First go to Castelia City and in 1 of the buildings a lady will give 1 of your pokemon a massage (in this case Riolu) then give Riolu a lot of vitamins zinc carbos protein etc and after you do that level it up somehow and the next level it should evolve into Lucario, I too am a Lucario Freak and I was soooo happy when my Riolu evolved! just do those steps I mentioned and it should be a Lucario very soon!

all you need to do is go to the bridges and get the feathers (alot cheaper than carbos ect)then give him all of them also give him a soothe bell which i think is in iciruss city then give him one rare candy or just level him up but in day time and he should become a lucario

Challengers Cave

I had this problem! Put him first in line to battle, have him hold that one bell (sorry drew a blank) give him a mesage everyday from the lady in castelia and gain xp with him it should work

Massages every day and also give it a soothe bell. Though it would have been better to give it this before