Details: One of the ten possible challengers you will face as you sit on the Champion's Chair in the Champion's Hall after defeating the Elite Four is Kahuna Hapu. She is seeking a Rematch with you after her recent loss, and she continues to specialize in Ground Type Pokemon.
Challenger Hapu - Level 63 Dugtrio, Level 63 Gastrodon, Level 63 Krookodile, Level 63 Flygon, Level 63 Mudsdale w/Groundium Z