You're more or less looking for pump and dump coins, I would imagine you've heard from some lucky investor how a certain coin can pump and give unexpected ROI, but mind you that more often than not, that is not always the case, it is indeed pretty risky to invest in pump and dump coins, except of course if you're only in the crypto network cause you want to get rich quick, if not, you should go for a long term project like Bitcoin and prolly do your research about other coins that are sustainable for the long period, but looking for coins that have very high volatility isn't the way to go, if guy have any intentions of being a successful trader.