where to upgrade sharkman karate in blox fruits

The Sharkman Karate upgrade NPC is the Sharkman Master in the Sealed Cavern on Submerged Island in the Third Sea. You need 500 mastery on Sharkman Karate to start upgrading, and the move upgrades use fragments plus headbands earned from the fights against him.

Where to go

• Go to the Third Sea.
• Travel to Submerged Island.
• Find the Sealed Cavern near the Coral Pirates, behind a house.
• Talk to the Sharkman Master there to upgrade Sharkman Karate.

Upgrade requirements

• Z move, Twelve Water Palms: Yellow headband and 2,000 fragments.

• X move, Pressure Vortex: Blue headband and 3,000 fragments.

• C move, Great Sea Spear: Black headband and 5,000 fragments.

Important note

You also need to win the Sharkman Master fights to earn the headbands, and if you fail, you may have to wait up to 40 minutes before trying again.

TL;DR: Upgrade Sharkman Karate at the Sharkman Master in Sealed Cavern, Submerged Island, Third Sea.