Ive currently been walking with my platnium team. That would be Alakazam, Staraptor, Rapidash, Empolion, Luxray, and my persian to make money. I need loads of it for my eeveelution team. Machamp is the 6th in my Platnium team. He's in the box with his pokerus he caught naturally from a wild pokemon some time on my way to the elite 4 in soul silver.
I'm so lucky I didnt need to trade or cheat for the pokerus!
**EDIT**
Oh you mean pokewalker not actually following behind you in the game?... For some weird reason I have bellsprout... I need to exchange that to Lugia