no one knows when the pump and dump prices are because the Crypto Market is unpredictable, but if you follow a lot of social news about Crypto it might help you to get better.
The value of a cryptocurrency is determined by the supply available and the demand for it, similar to shares & commodities like gold. In an ideal world this is true, but real-world factors like emotions, market manipulation & insider trading often cause this to no longer apply, or at the very least be distorted.