They usually have some initial price movements from beginning, especially if their devs did good marketing over some popular channels. Most of people in that case just wait for coin to hit on some exchange to buy some of them. But that is not a case on every coin. Some of them, which had ICO, slightly go down in terms of price because early participants who took some kind of ICO bonus, sell their initial investment and only leave ''bonus coins'' to hodl. If you are trying to earn some gains on those coins you need to research them very well before they hit any exchange. Best way to start looking for them is on announcement part of this forum