This level runs along water with various logs for you to destroy. As you near the end of the level, you end up going under water. If you manage to accumulate enough points, the Pokémon Phione will appear.
Bronze Medal Requirements:
Earn enough points to ride the rapids underwater and investigate the Pokémon; Phione
Silver Medal Requirements:
Investigate and capture the Pokémon Phione
Gold Medal Requirements:
Earn 80,000 points