An Undersea Place to Call Home!

While fishing in the Muraille Coast, Ash hooks a Skrelp who manages to poison Pikachu. Rushing for help, he finds a pair of marine archeologist who are willing to help Pikachu. While helping Pikachu, they tell Ash & co. that they are looking for a luxury liner which was said to sink around this area. Ash & co. decide to help out, but Team Rocket overhears this and want to reach the ship first to get the treasure. Who will get there?