There's even a whole thread dedicated to RNG'd Pokemon in the trade forum. If you really were "yelled at" by a Wi-Fi chat mod for just discussing RNGing and not anything like save states or finding out your SID via a cheating device (which are against the rules here) then I would recommend reporting that mod to one of the SMods or Admins here. Preferably with some kind of proof of the conversation like a screenshot or log.
But either way, this thread isn't the place for discussion about what a mod does or doesn't do. That kind of thing should be discussing via PMs.