As far as bitcoin or crypto currency is concerned then pump and dump is common phenomenon. You could find these kind of practices across all the exchanges across the world that too on regular basis. Interestingly bitcoin has its spread across the globe thus it is difficult pump and dump in specific exchange. However this kind of practice also result in reverse way as well. That is if bitcoin price in specific exchange could trigger other exchanges to follow the same suit.
Same is true for the alt-crypto currencies.