User blog comment:Mckrongs/Monster Hunter Frontier Season Forward 1/@comment-1758220-20110401233028/@comment-1758220-20110402160702

I think I can answer Ohmpakan's question. The earliest you can fight a Gurenzeburu in Frontier is HR 22. So theres a high rank version as well. All of the new monsters have a low-rank version, like Dyuragaua na dGuren are unlocked at the same time, and so on.