Quotei am having a hard time finding free happy hardcore VSTs
Just a general hint: Plugins advertised towards a specific niche genre are usually a dead-end, because they are extremely limiting. They are rarely the original source of "signature sounds", and more like a "best-of compilation" that can often not be customized properly, leading to every song using them sounding more or less the same.
That being said, any virtual analog synth that has a supersaw implementation should be able to produce that sound or an approximation of it. It's not much more than two layered supersaw sounds spread one octave apart, maybe with a bit of distortion on top.
Here's an approximation thrown together with Synth1 in a couple of minutes. You can definitely get closer than that with a bit more work or with other synths. Create a Synth1 instance in OpenMPT and load the FXP file through the menu bar. Play in octaves.