When selecting the move relearner, the game simply stops working. The move in question U-turn. I tested other Pokémon and other moves, but none of them caused the game to crash, only Yanmega's U-turn.
https://drive.google.com/file/d/1eidW4fX4g16syt7ro3KrZoRIazBKiBr8/view?usp=sharing