This is a really really easy boss especially compared to old pirate Cortez.This is like those Yux enemies back in the Great Tree the tentacles will attempt to defend Smorg. Start with Vivian's Fiery Jinx ability burning those Smorg Miasmas away to their death. Smorg will try out a few fancy attacks on you but nothing too bad. Once the tentacles are gone use Power Smash and Art Attack like a madman. If Smorg gets on your wrong side simply use Sweet Treat.When he changes form get even more aggressive with Mario's Power Bounce and Goombella/Bobbery using their best skills. Not tough.