Team Everlasting.
Team Everlasting became a pro team when they joined the Pro League in Season 5. They had stayed for three years before being eliminated from the league. For three years, 15th was the best ranking they had achieved, so they had never been an outstanding team.
But when they were placed in the Challenger League, they were enough to triumph over all. The resulting champions of the Challenger League were monopolized by these types of teams every year.