Pokémon Snap/Course 4: River

In this course, the Zero-One inflates pontoons and floats down the river. Most of the Pokémon here are water type. You can move back and forth across the river by looking at one shore or the other.
 * Challenge Score: 1,510,000
 * Unlock requirements: Take pictures of 22 different kinds of Pokémon over all of the courses.

Unlockable Items
Pester Ball - At 72,500 points in your Pokémon Report you'll unlock these which can be used to flush Pokémon out of hiding spots. Pokémon also don't like being hit by these in general and will react differently than when hit with Pokémon Food. Once again, you'll need these to continue to the next level.