Yep! He was the one who pioneered action dueling and entertainment dueling! He was a pro-duelist who loved entertaining the crowd! That's how he discovered and developed it!

How did a huge monster appear right in the middle of the park. Did it just appear from nowhere?

.... is it just in this city that they're real, or elsewhere too? There have been times back home where I thought I saw duel monsters in the street, but they'd vanish really quick. I always though it was someone's solid vision playing up.