From tomorrow, May 6, through June 25, Pokemon players in North America will be able to access the "Winner's Path Route" DLC. Pokemon available in the route, to those who pick up enough Watts with the Pokewalker accessory, include a Munchlax that knows "Selfdestruct," a Magikarp that can learn "Bounce" upon evolution into Gyarados and others, along with items like the Focus Sash, the Choice Scarf and the Choice Band. You can see the full details of the offerings here.
Can you resist the allure of a special Magikarp? Of course not!