Red Chasm is the eighth level in Pikmin 2's Challenge Mode. Its name is in reference to the huge population of Dwarf Bulborbs, Red Bulborbs, and Red Pikmin on its only sublevel, as well as the red treasures dropped by the enemies.
Try finding the Bulborb that has The Key. Leaving the course and returning to change the layout will be helpful here. Take out all Bulborbs in the path back to the Research Pod, making it easier by simply luring the Dwarf Red Bulborbs away. It may also be a good idea to carry the bodies of enemies back to the pod, so that they don't get in your way during future fights. Although there is no need to do so for a Pink Flower, you can collect other treasures if you have time by defeating the Bulborbs.
Using ultra-spicy or ultra-bitter spray can help a lot in defeating the Red Bulborbs, particularly if you can hit two at once with ultra-bitter spray. Also, always make sure you can hit them from behind. The Dwarf Red Bulborbs shouldn't give you much trouble, but try to keep track of your Pikmin while they are around, especially if your aim is a pink flower.
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