PokeChamp Gray is the former Kanto/Johto champion, Hoenn champion and Sinnoh Elite Four member, along as the secret 9th Gym Leader for Unova, Kalos and Alola. Gray is one of the strongest Pokemon trainers as well as a very popular child. If you are able to beat his late-region gyms, if you can find it in each region, the BlackBadge will give you immediate access to the championship, as proof you have defeated Prestigious Leader Gray, as he's called in the newer regions.