Does anyone know the location of all the friendly creatures, I have 5 but I`ve heard their is 9.

Brown Mu - found near Dali. He asks for 1 ore.
White Ghost - found near Treno. He asks for 1 ore.
Ladybug - found in the forest near the Black Mage Village. He asks for 2 ores.
Green Yeti - found in the forest near Madain Sari. He asks for 2 ores.
Green Nymph - found near the forest in Pualei Plains (by the Iifa Tree). She asks for 3 ores.
Purple Jabberwock - found in one of the forests directly east of Oeilvert. He asks for an emerald.
Green Feather Circle - found on the Lost Continent. He asks for a moonstone.
Rainbow Garuda - found in the forest of Popos Heights (right above Gizamaluke's Grotto). He asks for a Lapis Lazuli.
Yan - found in the forest on Vile Island (the big island right by the Iifa tree; aka "Fairy Island".) She asks for a diamond.

There's a happy creature hidden onder my pillow. asks for tagnuts.

Can I do this sub-quest when I first leave Terra when the entire world is covered in mist because I am trying and I keep finding Ragtime Mouse and not friendly creatures? and also which is Lost Continent??

I'm not sure if I've ever tried it before, but I don't recall ever reading anything about not being able to do it on Disc 4. Lost Continent is the icy one at the top. I've found the Green Feather Circle before near Esto Gaza, if that helps.

All I can say. If you do the quest. Friendly Yans blessing is such a help for Ozma.

that is the main reason I am doing it.