I see Gainer & Looser every day in Coinmarketcap. I always try to know, which coin will Suddenly pump? I've read a few article, But I can not understand it easily. Many people say learn Fundamental analysis. If you have knowledge about this topic. Feel free, You can share your skills & knowledge with everyone.
You cannot exactly know when a coin would pump because if there is a formula for it then many people would be rich by now. You may search for some hints though or signs that there is an impending pump for a coin if the volume is building up for that coin and there's an incoming significant event then maybe sooner or later it will pump.
If the buy volume for a certain coin is higher than its average then there is a possibility of a pump. You just have to observe the normal movement of a coin and if there are some changes when it comes to volume then there is a probability that sooner or later, it will have a significant change in price. You can use technical analysis as well for anticipating a pump like a break-out perhaps.