Mad Monk Urouge - All Special Skills & Gameplay Showcase | ONE PIECE Pirate Warriors 4 DLC (PS4 PRO) 

How do I unlock his transformation?

Just checked for ya and you need the "Marco's Mark" coin. You get this by clearing the stage "Harsh Winds and Strong Waves" which is a lvl 8 quest in the East Blue Treasure Log

Ok thanks

You need the "Marco's Mark" coin. You get this by clearing the stage "Harsh Winds and Strong Waves" which is a lvl 8 quest in the East Blue Treasure Log

Yup! Can't hide a Dutch accent haha

You need the coin "Whale Shark", which is a reward for the lvl 3 mission in the East Blue Treasure Log "How to Live in This Ocean"