There seems to be some confusion here, the Hunt Club sidequest is not the same as the Mark Hunts. Basically you meet three hunters on the Phon Coast as part of the Hunt Club and if you get the best pass available in Archadia you can meet the gentlement who sponsers them which nets you a quest to join the club. You fight Rare Monsters to get their trophies they drop when defeated and give the trophy to one of the three hunters so they will open one of their shops with cool equipment or items but which shop becomes available depends on which hunter you give them to.

It's basically a sidequest designed to make you finish the bestiary on top of the Mark Hunts, Elite Mark hunts and optional boss fights. So bosses like Hell Wyrm and Yiazmat are not part of this deal.