User blog comment:Lord Loss/Monster Appreciation Week: Glacial Agnaktor/@comment-26074976-20130714215342/@comment-10592682-20130715020827

In Moga, you have to finish the 9 star quests to hunt Azure Rathalos, Sand Barioth and Nargacuga. After finishing those quests, talk to the argosy captain. He will unlock 4 more quests for you: A quest to hunt Black Diablos, a quest to hunt steel uragaan, a quest to hunt azure Rathalos and pink rathian together... And a quest to hunt glacial agnaktor.

Also, all 4 of these quests must be finished to advance.