As you earn first place in each of the Mantine Surf Courses, you will learn new tricks that you can use with Mantine. However, there is a secret trick that can further be unlocked. In order to learn this given trick, you will have to earn first place in all four Mantine Surf Courses. On top of this, you will have to claim and obtain the Surfing Pikachu. After you have, you will unlock the secret move called Over The Gyarados (Up, Right, Down, Left). But watch out, as doing this move consecutively will actually cause you to lose points.