Firstly, the things u must bring with u on a quest to beat one are:

* deodorant (about 5-6 of them if its ur first tym)
* psychoserum X3 to find it
* paintballs
* flash bombs will be helpful
* bring some potions and mega potions(mega potions opional)
* whetstones if u have got a blunt blade(with no green bar or better) thats about it.

This beat can get pretty frustrating to beat, i know, i almost broke my psp in two the first tym i faced this thing. when u first enter the quest, get to an area where there are lots of ways to get to different areas, then use ur psycoserum. quickly rush to that area then paint the congalala. the first thing i always do when i face an congalala, is to hit the tail a couple of tyms, therefore after a while the thing its tail is holding(i think its a piece of bark but may vary) will come off, u will know it came
off because the congalala will 'fly' 4ward an struggle 4 a bit. now here are two ways of finishing it off:

1) to slay the congalala, use the portable shock trap or any type of trap u want 2 catch it, then if u r using a great sword, quickly carge it up near to the congalala and let rip,then just hit a few tyms. when it gets out it wont be very happy, well u will know when its angry because its face and butt will be red, WATCH OUT HERE beacause it comes at u hard, i recommend 4 first tymers 2 w8 till it bcomes normal then just attack him how u lyk,and watch out 4 when it jumps in air, even if u do seem to dodge it, keep far away when its in the air beacaue if it lands near u u will b immobilised 4 a few seconds.

2)if u want 2 hunt the congalala,save ur traps till end, i dont really ltk to catch these as sometyms i misdudge an when i tranquilise em they dont sleep! well if u do want to capture them and get more rewards then just keep trying to hit the thing in the head a few tyms, when he jumps and lands he will b on floor about 3-4 seconds thats ur tym 2 attack hard! and
remember to WATCH OUT WHEN IT TURNS RED. u will know when its almost dead when it jumps to different areas. u can gamble it by using traps on it when it first moves area, or if u want to b on the safe side, w8 till its at its home place where it sleeps and w8 in the area b4 that so it has tym 2 fall asleep, go into the area an if its alssep use a trap right next to it, when it falls in, use the tranquiliser bombs, and hopefully it will sleep and there u go u caught it!!!