all altcoins are just pure speculation scam
There is a way to predict that. The coins that get trolled a lot

When they start getting trolled it means that one or many guys instinctively know that the price is going up and they try to stop it.
Take for example "sdc-have-no-tech". This guy even got a specific nickname to troll SDC

Meaning that SDC price will go up soon

There!