Wikstrom's Klefki was the main object to the third and final trial at The Castle of Chivalry. The object of the trial was to open the locked door behind
Wikstrom but the key was connected to Klefki.
Wikstrom said that
Ash Ketchum and
Goh would need to combine their skills to take the key from Klefki.
Goh managed to get the key and finish the training trial.