Monster Hunter Freedom Cheats

Pet Pig
After you beat the second urgent quest, there will be a guy walking around with a backpack (not the little old lady with the HUGE backpack). "Talk" to the pig and the cooking music will come on. You pretty much "cook" the pig. As soon as the "!" appears press X. The pig will follow you around. Go home and save. If you quit the game the pig will stay in your house.

Thanks to Jiraiya2006 who added that pleasing the Pig will give you luck, which will result in better rewards after the mission.