Monster Hunter Generations does not have levels, but they do have ranks. These determine with quests you can take, which also determines which monsters you can hunt for gear. If you want the best gear, you have to keep raising your HR (Hunter Rank) and take on the strongest monsters.
Search Monster Hunter Generations Ultimate. Monster List. Mount and topple monster twice: 60HRP: Key.
The the good news is you only need to do certain Required Quests to unlock the next rank. The bad news is the game does not tell you which ones you need. The great news is I will let you know everything in this guide!
If you would like general help, or just getting started, please visit my Monster Hunter Generations Beginner Tips and Tricks.
The game doesn't tell you which quests are needed and there are several extra quests you don't need to do. I'll list only the required and urgent quests for each rank.
The below info is listed by what rank you need to be to do each mission, Completing the Urgent Quest puts you up one rank.
That's it for my guide on how to raise Hunter Rank in Monster Hunter Generations. Let me know if you have any questions or if I missed anything!