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In gen 1 there wasn't a champion, only the Elite 4 because Lance was too hard to beat and only Blue defeated him and become the champion.
In gen 2, after Red disappeared and Blue returned to Kanto, Lance was promoted to the position of champion.
In gen 3 Steven is the champion from many years, and nobody knows about the Elite 4, so many didn't defeat all the gyms, while in Emerald Wallace was champion, but Steven was the champion before him in recent years.
In gen 4 Cynthia is the champion of the region since she was young.
In gen 5, Alder is the champion of the region from many years, but he doesn't want to battle anymore. In B2W2 Iris became the champion after Alded decided to retire.
In gen 6 Diantha is the champion.
In gen 7 Kukui is not the champion, but the founder of the League of Alola, but Kahili was one of the most recent Champion of the trials.
In gen 8 Leon is the undefeated champion, and also Mustard and Peony were champions many years before.
In gen 9 Nemona is the champion, and Geeta is the champion and manager of the region, but since she is always busy, she delegated Nemona to be the champion of the region, as she is the most recent champion who defeated the Elite 4 and Rika's test.
