We just released pixelmon install assistant software (few-clicks installer), so if you still don't have MC & pixelmon installed make sure you try it. It's possible to install pixelmon 3.5.1 & 5.0.0 versions using assistant. You can download it directly using this LINK
This installer officially marks our release of pixelmon mod 5.0.0 version, which you can access from server hub like rest other servers.
If you encounter any bug using assistant please take a 2 minute and post a bug report so we can improve it in future versions.