A Pokémon League Champion, 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 Pokémon Champion (if there is one). The Champion usually resides in the Indigo Plateau with the Elite Four but some relinquish the position to pursue other adventures, train, or retire. This is the case with the current Kanto Champion, Red, who left his Champion duties to the current Johto and ex-Kanto Champion, Lance.
The current dragon master of Blackthorn City and Cousin of Clair the Blackthorn Gym Leader, The Player meets Lance at the Lake of Rage in Johto and assists him in defeating Team Rocket in their base in Mahogany Town. Though he is only the Johto Champion he was once the Kanto Champion as well and currently serves as the Kanto Champion in Red's place.
After watching the exchange between Lance and Silver in Dragon's Den Lance changes up his team.
A trainer from Pallet Town in Kanto, Red became the Kanto Regional Champion 3 years before the beginning of the story after defeating his Rival Blue. Shortly thereafter he gave his duties as Kanto Champion to Lance so he could go on a training journey into the wilderness. He can be found on top of Mt. Silver and will battle when spoken to.
After receiving a Kanto starter from Professor Oak Red's team will change slightly based on which starter you choose.