How do you get sea pass in Pokemon liquid crystal?

In Pokémon Liquid Crystal, you can obtain the Sea Pass by completing the tasks in the game that involve the Orange Archipelago. Specifically, you need to defeat the Elite Four and become the Champion to gain access to the Sea Pass. After that, you can challenge the Orange League and receive the Sea Pass from a character once you've met the necessary requirements. This item allows you to travel to the Orange Islands for additional challenges and adventures.