Start a new day and out a few Pikmin. Take them directly to an enemy and start fighting. If you encounter anything on your way to the enemy, this trick will not work. As soon as the fight begins, pause the game and select "Go to Sunset." If you didn’t do anything else special that day, Olimar's log entry will describe the enemy. After reading the log entry choose “Don’t Save” and the title screen and then choose “Continue From Last Save” to avoid wasting an entire day. This doesn’t always work since sometimes other events, such as discovering a new color of Pikmin, will happen and thus appear as the log entry.