If you go in the forest, it's all the way at the end where you find the prospecting area.
You get it from Sharon's house she has the bubble essence
You can get Icecube essence from light poles. :)
there are many many ways to get the fire essence like the patios
You can get them at the patios and benches.
you can get the moon essene at the professors lab. i haven't figured out where to find the bubble essence either
The essence is located in the forest. The north east. You have to have a star level 3 to unlock the forest. The essence grows on a tree.
its in the junkyard of the desert gl!!
you get it on the royal academy island
you get them from torjiros place.
the curio shop
go into the forest x
The ski lift where Dean is.