|Octagonia, Man to the left of the counter||The Dapper Chap|
Once you've solved the mysteries of Octagonia and defeated the boss in the caverns below the Orphanage, return to the arena entrance and look for a man left of the counter. He needs help tracking down some Mellow Vera for his skin which can only be found in the Dundrasil Region.
If you travel to the north-west corner of the Dundrasil Region, north from the Campsite, you'll find a Flower gathering point. Hack away at it to obtain some Mellow Vera that you can hand over to the man in Octagonia. As a reward, you'll obtain a Recipe Book with a new costume for Sylvando.