Pascal is a philosopher otter. If you get a diving suit and catch a scallop, Pascal will appear and ask if you will give him the scallop. In exchange, he gives you a piece of Pirate furniture.
You can purchase a diving suit on the island. Just go on island tours to win medals, then use the medals to purchase a diving suit from Grams's gift shop. Her selection changes every day, so check back often until she sells a diving suit.
Scallops are deep sea creatures that can be caught year round. They have medium shadows that move in an erratic, jumpy pattern. They are very rare from February through April, and very rare in October. They are somewhat rare from May through September. They are somewhat common from November through January. On the island, they are somewhat rare from 9AM through 4PM, and very rare the rest of the time.
When you catch a scallop for the first time of the day, Pascal will appear nearby and ask if you will give it to him. Say yes. He will give you a piece of Pirate furniture and swim away, eating the scallop.
The following is a list of furniture that you can get from Pascal.