A Dengeki, the Japanese gaming mag, sponsored quest. Capture a Furu Furu (フルフル) in the swamp at night. Bring paint balls (ペイントボール) to track it and hot drinks (ホットドリンク) for the colder areas. A weapon with Fire elemental damage will make your task easier and hitting its head, though risky, will yield higher damage.
A Weekly Famitsu sponsored quest. Capture a pair of Baba Konga (ババコンガ) in the swamp. The giant monkey moves in area 2, 4 and 8, the latter is its resting place where you should get your traps ready to capture it. Its attacks are rather predictable, but if you are on close range weapons, just look out for those yellow colored gas which will prevent you from using the health items. Just use the deodorant bombs (消臭玉) to quickly remove that.