I made this Hardstyle Lead template with stock plugins from FL studio.
All you need is Sylenth1 (or you can replace it with another synth) & OTT (which is free)
But you don't need the OTT for this. This project is just a demonstration on how to set up the reverb and delay for you leads
In the project you will discover that you don't really need a lot of layers to make it sound good.
I use this technique myself, just with different plugins to give my sounds more depth and personality.
All the leads are from my Sylenth.1 bank.
FLP on how to make a Hardstyle Lead