Location: Glass Palace, Seaside Kingdom
Phase 1: Mollusque-Lanceur, a giant octopus, attacks by spitting ink and launching shells. Capture a Gushen (the water-spouting octopus) nearby. Use the Gushen's water jet to clear the ink and propel yourself towards Mollusque-Lanceur. Aim for his eyes when they are exposed. He'll retract after being hit.
Phase 2: He'll become more aggressive, spitting more ink and launching more shells. He might also try to slam his tentacles. The strategy is the same: capture a Gushen, clear ink, and hit his eyes. Be careful not to run out of water with the Gushen.
Phase 3: Even faster and more chaotic. Continue using the Gushen to hit his eyes. Three hits will defeat him. The key is efficient Gushen usage and dodging his various projectiles.
Reward: Multi Moon