Go Tosolea and buy one to five level 1 Fairies. Bring them into a training match with whoever you want to get emblems and put him on team A and the Fairies on team B. Make sure the Fairies have no armor or weapons. Since they are so weak, you should be able to hit them and get emblems easily (such as War God, Berserk Knight, Certificate Lancer. Philosopher's Stone. Animal Hunter, and more).
Note: This trick requires the "Numida Chronology" for quest mode. Go to quest mode and select this Chronology, since it is free and unbelievably easy. You have an option to set how many turns to defeat the leader or all enemies. The greater the challenge, the better the prize. Since all of the enemies' levels are "15", try this at a very high level to get the best results. Your prize can range anywhere from 25 to 3000 Goth, and Ultra-rare items such as the Sandstorm Bow.