I entered Crypto market for 2 months and usually see the term "pump and dump", and some P&D groups. But i wonder they pump by selling and buying themself, so when price go up, who will buy it for them and they sell that for who???
With Blue-chip coins, someone could buy when it've pumped already because of good news. So with trash coins, who'll buy this pumped coin and why many PP&D group still live until now

When ever there's a pump there will be news going all over around about how that coin is a great coin and how it's going to keep going to the moon . So obviously you will have people who are following the hype and trying to jump in before it's too late . Those are the people who will buy the pump . Then after the coin start dipping a little bit ,there will be people who buy also thinking it's a good time to get in (buying the fake dip). That's how easy the p&d groups fool traders. This is a better explanatory video :