The friendly monster side quest involves locating a number of creatures around the world map in the forested areas. You can find each of them in any order that you prefer, however you cannot find the last Friendly Monster (Yan) until you have found all 8 of the other monsters. Finding Yan before you have found the others will cause it to run away.
When you encounter one of the friendly monsters listed below, it will ask you for an item of some type. You will have to select the “Item” command and ‘use’ the item on the monster.
Mister Nice Guy
You need to befriend each of the Friendly Creatures in the game in order to obtain the Mister Nice Guy Trophy. Normally, this trophy would not be missable, however, do keep in mind that you will need to have the required Jewels in your inventory to give to each of the Friendly Creatures. Be careful not to sell or synthesize too many of them!
Located in the Gunitas Basin on the Mist Continent, in the plains near the Village of Dali.
Located in the plains around the Village of Dali and near the Bentini Heights just outside of Treno on the Mist Continent.
Located in the Magdeline Forests around the Black Mage Village.
Located in the forests near Madain Sari or in the plains near Gizamaluke’s Grotto and Burmecia.
Located in the Pualei Plains near the Iifa Tree.
Located in the Seaways Canyon, in the forests near Oeilvert on the Forgotten Continent.
Over the Moon
Located in the Mitmakis Ice Field on the Lost Continent (near Esto Gaza).
Located in the Popos Heights forests which can be reached by climbing up the ladder near Moguta in Gizamaluke’s Grotto shown in the screenshot below. The forest is located just above.
Located on the Vile Island (which is just southwest of the Iifa Tree). Yan will should “Have you met the others?” and run away if you have not found all of the other friendly monsters involved in this side quest.
Finding Yan completes this side quest and also affects the final battle against Ozma by making it vulnerable to Shadow-based damage.