You get it from Sharon's house she has the bubble essence
you can get the moon essene at the professors lab. i haven't figured out where to find the bubble essence either
the curio shop
You need the bubble essence
You can get them at the patios and benches.
you get it on the royal academy island
you get them from torjiros place.
there are many many ways to get the fire essence like the patios
The ski lift where Dean is.
it comes from the DJ booth
It's easy to mine at the royal academy
You Can Rummage From Dressers, Or You Can Go To Cutopia And Mine.
The gondola where Amy is, but not Emily. In case you want to now, the planet essence is at the ski lift.