After becoming the Champion, the player may repeatedly participate in a Champion tournament at Wyndon Stadium, which consists of three rounds in a single-elimination tournament.
These Trainers may appear in the tournament after receiving their rare League Cards, either randomly or by the player's invitation. With the exception of Piers, they all have a Pokémon that they will Gigantamax at the first opportunity. They are listed in the order they are presented when asked for an invite by the League staff attendant. If the player chooses to invite one of the following Trainers, that Trainer is guaranteed to appear somewhere in the tournament bracket, but may be eliminated early and therefore not battled.