Petitioner on this one is Viera called Rena. You'll find her in Eruyt Village. She says that after "someone" killed Rafflesia in Feywood a Malboro appear that stink so terrible, that Vieras in Golmore can smell it and it their senses. She asks you to deal with that problem.
About 114 000 HP
Resistant to Libra,
Vulnerable to Wind (all of them)
This monster can be found in Feywood exactly in the same place where you fought with Rafflesia. Also ordinary Malboros appear with him, but they aren't especially strong. Just use Aeroga on them and they're gone.
The Wild Malboro himself doesn't have any typical physical attacks (except for the normal one, with which he also hurts himself). He mainly bases on various Breath attacks effectively messing up with your status. If you have Ribbon that's great and there's nothing to talk about, but if you don't get ready for intense healing, because he can cause virtually every bad status there is. It's very important to keep one character away form the battlefield so that she could react on time and heal her allies.
At the very end of the battle he'll try to use Soul Etude, which would restore his HP, but if you're quick enough you may be able to finish him off before he can stop casting it.
Bounty: 4600 gil, Euclid's Sextant