SpongeBob SquarePants: The Cosmic Shake

This should come naturally however if you would like to speed it up I found a good area to farm.

This can be done on the Karate Downtown Bikini Bottom level, the checkpoint is called Parking lot.

You'll find a bunch of Tiki's in this area and each time you reload the checkpoint they will respawn.

There's also a dumpster in this area and each time you hit it you'll receive two jellies and you can farm it infinitely.

Hopefully they don't patch this.