There are two parties involved in a pump dump scam. The first are the market players that pump a token - commonly a less popular cryptocurrency colloquially reffered to us a shitcoins. These players buy up a significant amount of these tokens and begin pumping them across social media. For pumpers, token that are easily manipulated are the best target, These token often possess a relatively low circulating supply and a small market ca. pumper will operate in a groups often working via telegram and will purchase these token en masse which causes the valu of token to rise.