The mainline Pokemon video game series has a long list of elite trainers that put players to the test as they travel across the many regions of the Pokemon world. From powerful Frontier Brains that operate the Battler Frontier to the mighty Elite Four members that test players' wit and skill as they progress through the series' various Pokemon Leagues to become the Champion of their respective regions, the franchise is not shy of putting up a tough challenge for avid Pokemon trainers.