The Caterchipillar is an enemy in Final Fantasy XIII-2. They appear with other Caterchipillars or with a Mewmao. They are of little danger to the party when compared to other creatures found in the area.
The Caterchipillar is a Medic. It is easily surpassed by other Medics, given its low stat development. However, it is a good monster to infuse, as it is the only creature with the Resist Elements +30% passive ability available for infusion (Pink Lily has only +20%, and it is red-locked). It can infuse the Role ability Esuna, from level 1, to Medics lacking it, such as Green Chocobo. Similarly, it can infuse Esunada once it is at its maximum level of 45.
Resist Elements +30%, Auto-Haste, and Auto-Tetradefense are the only three abilities with the highest (ninth) rank, so they can never be replaced by other abilities.