It depends on the market you are trying out. However, you yourself cannot do a pump and dump with little money, but you can participate in one. However, if you are referring to pump and dump groups, then you should not bother, as this would end up making you to lose your funds. Most pump and dump markets are shitcoins anyway, so you can just take the risk, take a look at the previous trend on the charts, and then buy in at the dip and set a sell order for whenever the pump happens. Most of these coins can go as high as 50 - 100%, so you can gradually make profit. However, you can also end up bag holding shitcoins in the process if you end up unlucky.