i just beat the game and beat all in arena and when i talk to that mynos the elder he says: my descendent Eugene Poole is scouting monster somewhere on the islands. if you see him, hail him, and challenge him to a monster scout battle. but do remember that my blood runs in his veins. a scout of his pedigree shall present a formidable challenge. be on your guard, young man, be on your guard. i dunno where to look for this person.
I ran into him for the first time today at the zip portal where you're about to meet leonyx(dark world?) he used a green dragon and the small yellow one that drops martial artist scrolls in the doubtback. He is much harder than it looks, I was actually looking to scout a monster with a weak team and almost lost haha.