After the eventful stay at The Village of Dragons, the time has come, for Iris to challenge Drayden who's known to be the president of the academy that Iris goes to, and Gym Leader of Opelucid City. It had been years since she first battled at her hometown, and lost to him but now she feels like she is fully prepared. Will Drayden beat her a second time or has Iris learned a few things since her defeat?
This marks the second time Iris lied about something because she's not actually becoming a Dragon Master but becoming a Gym Leader of Opelucid City too. That explains why Ash was traveling with another character who's also a Gym Leader all along. First was his friend Misty from his home region in Kanto.
It is revealed that Iris was one of the students who's been falling behind in Drayden's academy because all she did was giving Pokémon command everytime. That explains why she lost to Drayden in the first place with her Excadrill in BW036: Iris and Excadrill Against the Dragon Buster!.