Tool-assisted speedrun played on emulator.
Total time to complete 19:33.
I skip dialogues to save time:
"Blast you to the Abyss! How did you escape my labyrinth?
Well, I trusted my pets, the constrictus', did you no harm.
Ah! And I see you have the other five Treasures of Rule!!!
This may well be the best day of my life. Now that all Six Treasures of Rule are on-board my ship, I will control the Dark Water.
With that power I will become Ruler of Mer! Hah hah hah!
But first I need your five Treasures.
Come then, hand them over before I become angry!"
"You may have won this time!
Take the Treasure of Rule and leave my ship before I get nasty!
We will meet again young pirate, but in the meantime there are plenty of ships that I can attack to keep myself busy.
As for my idiot crew-members, they will be spending some time with the constrictus."
"Roaaaaaar! Who dares enter my realm?
Hah hah ha, just a pirate looking for treasure, I see
You chose the wrong cave to explore, pirate.
I can destroy you with a single thought! Prepare to die, human!
Wait, what is this? It can't be! Arrrr, I feel the force of the Six Seals!!!
The Six Kings of Mer already used them to imprison me once, and even they failed in the end. What makes you think you are any different?
Primus was the King of Octoponm you are just a pirate in the wrong place!
What chance do you have in weakening me?
Surrender, and I will have pity, and end your life quickly!!!