If you are asking a platform or a mobile app where you can do daytrading, I suggest binance because in my experience they got a good android app. Now if you are asking for coins that you can daytrade, all of them can be. If one person knows what COIN is it then he/she must be rich by now. You can daytrade all of the coins in an exchange but you don't know when you will take profit because nobody knows the move of each coin. One more, daytrading is very stressful and risky base on my experience so I stopped it and I often hold my coins and I am not selling my coins at a loss.