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 a good end game Medic because of its high HP and good Magic stat, reaching around 5000 health and 565 Magic. Infusing a level 24 Tonberry's Magic +35% will give it around 635 Magic which is incredible for an end game Medic. It is recommended to have it learn Curaja via infusing Sentinel monsters to make it even better. However, it is also 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 have the highest (ninth) rank, so they can never be replaced by other abilities.