To have an idea, go to the losers. If you are not yet good with those good altcoins that you have then, you can have an idea for these type of gainers and losers for the day/week.
https://coinmarketcap.com/gainers-losers/PS: DYOR.
Yes I normally do that, but it's not easy to choose

I was looking more for a possible "sleeping giant", since the investment it's little...hard to find something looking at day/week losers.
Hard to tell about that description for every coin.
Because if we're looking for it, many of them can be one. Just observe what are those gainers have been doing, they're not common and we barely see them getting stable.
That's the reason why we're barely going to see one by just looking at them and research is needed to understand if its market can be good as that description that you're looking at.