User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-4841654-20130218003619/@comment-28303251-20130218021857

It starts off by going up in rank from 1 to 9 (or something like that) by completing Urgents that allow you to go up in rank. After your last Urgent in the Harbor your rank will go up in Tri's style, I'm pretty sure it even increases this way during village quests too.