Tale of the Chaquetrix (Reader X Ben 10 Universe)

Y/N was just an ordinary unlucky boy. He has lived in Bellwood for years being about 3 years older than Ben. They grew up together often having a brotherly relationship. However he finds himself struggling more than ever. After a small period of dating Gwen she ended things leaving Y/N alone with his tendency for misfortune. But after his tournament with Ben, the latter asked him to join in visiting his grandfather. This marks the start of a very unusual adventure.