User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-4452412-20121004212915/@comment-3062343-20121005013107

Narga Rare is HR40, Dual Hungry Jho is HR45, Gold Rathian and Silver Rathalos I think are at HR50, Lagiacrus Rare is HR70. I think at HR80 theres a quest to hunt Nargacuga, Barioth and both subs. HR90 theres a quest to hunt Barroth Sub, Diablos, Uragaan and Duramboros. HR100 unlocks a quest to hunt Brachydios, Rust Duramboros, White Lagiacrus and Stygian Zinogre. There are a few more quests that unlock at certain HRs, but none after HR100.