To get the Pink Coat in Blox Fruits, follow these steps. First, head south from the Pirate Starter Island to reach Prison Island, which is for levels between 190 and 250. Once there, find the Swan boss located in the middle of the island.
Next, engage in combat with the Swan boss, who is a level 240 boss. You can make the fight easier by attacking him from behind a wall. If the Swan boss is not available, wait for 30 minutes for him to respawn.
You may need to defeat the Swan boss multiple times, as each victory gives you a chance to obtain the Pink Coat, but it is not guaranteed. Keep at it until you get the Pink Coat.
Once you obtain the Pink Coat, equip it to enjoy a health boost of 200 and a 10% increase in gun damage. Happy hunting!