I just won my first one finally. I've heard that the reward was
golden pokeballs or a retro egg or something....but he's trying to
give me 5 berries? I can say "thanks" or "are you kidding me?". Is
this a trick question? Lol. Idk if I can ruin my chances of getting
another quest if I select the 2nd answer...but really. Berries?
Don't worry, the answer you click doesn't really affect what
happens! As for prizes, they range depending on which contest
you've just done. Just keep doing them and you'll get better
prizes!