Pokémon Champion

A Pokémon League Champion (Japanese: リーグ優勝者 League Champion), normally referred to as simply Champion or Pokémon Champion (Japanese: チャンピオン Champion), is the highest known level of rank for a Pokémon Trainer. The title is also colloquially referred to as League Champ (Japanese: ポケモン リーグの ちょうてん Pokémon League's Greatest).

It usually refers to a Trainer who has completed a Pokémon League by collecting all the necessary Badges, and either winning a regional Pokémon tournament or defeating the Elite Four and the previous Champion (if there is one). Kanto and Johto share a Champion, while other regions have their own. If a Champion is defeated, they must relinquish their title to the victor; however, the victor can refuse the title, as N did in Pokémon Black and White.

In Generation VII, the player as Champion can defend the title against challengers.

In the games
Champion is a Trainer class that first debuted in the Generation I games. It is the title held by the Trainer who last defeated the Elite Four and the previous Pokémon Champion. Each Champion is always stronger than the Elite Four members and most other Trainers, and has a party of six Pokémon to test their opponents' strength. Like Elite Four members, they employ the use of strong healing items. To challenge the Champion, Trainers must defeat all four Elite Four members without leaving the Pokémon League area, and cannot access the Pokémon League Pokémon Centerand Poké Mart until after defeating the Champion or losing at any point during the challenge. If a challenger is defeated by the Champion, just like the Elite Four, they must start over.

Since in every core series game the player goes on to defeat the standing Champion (except in Alola, in which case there is no current Champion and the player battles Professor KukuiSM/HauUSUM instead), every player character is considered a Champion and subsequently entered into the Hall of Fame, along with the player's party. However, for players in games other than Pokémon Sun, Moon, Ultra Sun, and Ultra Moon, becoming the Champion is mostly a symbolic honor, as they are unable to battle challengers or take up any other league duties; the former Champion will still remain at the Pokémon League, retaining the Trainer class Champion (in Generations I and III, Blue clearly stated his reign was over; in the Delta Episode, Zinnia teases Steven that he is the former Champion). In games prior to Pokémon Sun and Moon, the player may battle the Elite Four and the former Champion as many times as they like, and on each success will be re-entered into the Hall of Fame with whatever team was used in that challenge. In Alola, the player can instead battle the Elite Four and then take on a challenger, being able to do this as many times as they would like.

In Black and White, Cynthia tells the player that once every few years, the Champions from all the regions come together and battle to find the strongest among them. In the Pokémon World Tournament in Black 2 and White 2, which takes place 2 years later, all the Champions the player battles in previous games participate in the Champions Tournament. This tournament does not include player characters, with the exception of Red.

In Sun, Moon, Ultra Sun, and Ultra Moon, the Pokémon League of Alola, having just been established, has no Champion. Instead, Professor Kukui (the league's founder)SM or Hau (the player's rival)USUM, stands in as the final obstacle the player must overcome before becoming the league's first Champion. In another first for the series, the player can defend their title against challenges from non-player characters. The player keeps the nominal title of Champion even if defeated. Similarly, in [https://bulbapedia.bulbagarden.net/wiki/Pok%C3%A9mon:_Let%27s_Go,_Pikachu!_and_Let%27s_Go,_Eevee! Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!], Trace is the Champion of the Indigo League at first, but loses his title to the player. After defeating Lance in a rematch, Trace will challenge the player as a normal Pokémon Trainer in an attempt to retake the title.

In Let's Go, Pikachu! and Let's Go, Eevee!, Professor Oak reveals that originally, Trainers who defeated the Elite Four were recorded as Champions, but now Champions were going to be established as a part of the Pokémon League challenge, meaning that now a Trainer can only become a Champion by defeating the Elite Four and the current Champion.

Known non-player Champions in the games: