Three. I just mentioned the Riolu because it was a pain to find another one.<br/><br/>The funny thing is, I never win anything. Entered all kinds of contests. Never won more than a free soft drink. And once when I was 7 I won a Halloween contest. I think I just got my hands on a extremely lucky copy of SS. And IDK about W2. The Psyduck was a surprise. But I imagine you might have a better chance of getting at least one in B/W2 because you get one of those medals for befriending a shiny Pokemon. Unless like SS, there's a built in story shiny or a Wi-Fi event one. Otherwise the medal seems kinda pointless with the impossible chance of catching shinies. I will say one thing. The ones I've gotten have all been after I deleted a save file and started playing again. IDK if that has anything to do with it. But it's a likely idea.