To find the Rubber Fruit in Blox Fruits, start by locating the Joy Boy. The Joy Boy spawns every hour under one of the purple flower-type plants at Tiki Outpost with a 20% chance. Once you find him, interact with the Joy Boy to initiate a dialogue.
Next, you need to master the techniques of the Human Fruit. Make sure you have mastery 300 in the Rubber Fruit to proceed. After that, you’ll need to pay 20,000 to continue.
The Joy Boy will then ask you to fetch his helmet. The helmet can spawn anywhere within the Tiki Outpost, so search thoroughly to find it.
After completing all these steps, you will unlock V5 of the Rubber Fruit and receive the title “Sun God.” This process will help you gain new abilities and enhance your gameplay significantly.