Do you believe in "Ghosts"? Well I didn't mean those scary ghosts in the movies, but I'm referring to "Ghosts" in this game, Monster Hunter Portable 3rd. Want to see them? Then prepare yourself >.<
1. Equip yourself with the weapon "Hammer". No requirements for armors.
2. Find a quest to slay Kelbi or Anteka, or any quest that consists of Kelbi or Anteka in it.
3. After you face the Kelbi or Anteka, run then press Triangle to do an unsheated attack.
4. It should kill the monster instantly, with the "stars" above its head. Now carve the monster.
5. The monster will suddenly stand up, and run away. And after that, they'll disappear...
Note: You can also use weapons other than Hammer. Anything else that can "Knock Out" a monster to trigger the glitch.