From Bulbapedia, the community-driven Pokémon encyclopedia.
Wooper's Juggling Game (Japanese: ウパ-のおてだま Upah's Juggling Game) is the name of a Pokémon-based e-Reader application. It is a minigame featuring Wooper. Four cards are required to play this minigame: Chinchou, Mareep, Totodile and Marill.
In Wooper's Juggling Game, the player takes the role of a Wooper. The objective of the game is to use Water Gun to keep Poliwag and Totodile from hitting the ground. Points are accumulated by sending one of the Pokémon flying by hitting it at close range with Water Gun. After 3000 points have been accumulated, Psyduck will join the game. Poliwag falls faster than Totodile, while Psyduck requires two blasts of Water Gun to send it flying. The game ends if one of the Pokémon lands on the ground.