Wikstrom as a member of the Kalos Region's Elite Four.
Ren found a flyer for The Castle of Chivalry and suggested that
Ash Ketchum and
Goh go visit as it said that all Trainers and Pokémon who desired to find their true strength were welcome to receive personal training from Wikstrom.
Wikstrom was seen battling against
Diantha in a large stadium with many spectators. The battle was obviously very important but little details are known other than the fact that he ended up loosing the battle.